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Development of Magnetoresistive Halfmetals and Halfmetallic Composites for Spintronics

Research Project

Project/Area Number 15206071
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field Inorganic materials/Physical properties
Research InstitutionTokyo Institute of Technology

Principal Investigator

KARPPINEN Maarit  Tokyo Institute of Technology, Materials and Stuctures Laboratory, Associate Professor, 応用セラミックス研究所, 助教授 (50334529)

Co-Investigator(Kenkyū-buntansha) MATSUI Yoshio  Tokyo Institute of Technology, National Institute for Materials Science, Chief Researcher, 物質研究所, 主席研究員 (80354398)
MOTOHASHI Teruki  Tokyo Institute of Technology, Materials and Structures Laboratory, Research Associate, 応用セラミックス研究所, 助手 (00323840)
YAMAUCHI Hisao  Tokyo Institute of Technology, Materials and Structures Laboratory, Professor, 応用セラミックス研究所, 教授 (50271581)
Project Period (FY) 2003 – 2005
Project Status Completed (Fiscal Year 2005)
Budget Amount *help
¥41,600,000 (Direct Cost: ¥32,000,000、Indirect Cost: ¥9,600,000)
Fiscal Year 2005: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2004: ¥13,390,000 (Direct Cost: ¥10,300,000、Indirect Cost: ¥3,090,000)
Fiscal Year 2003: ¥25,740,000 (Direct Cost: ¥19,800,000、Indirect Cost: ¥5,940,000)
Keywordshalfmetals / spintronics / double perovskite oxides / tunneling magnetoresistance / mixed valence state / Mossbauer spectroscopy / sol-gel method / composites
Research Abstract

Our three-year project was focused on halfmetallic (HM) oxide materials that are conducting ferromagnets with 100 % spin-polarized carriers (in an ideal case). Such materials form the bases for tunneling-type magnetoresistance (TMR) devices application of which is found in the presently emerging new technology called spintronics. Among the handful of HM materials discovered so far, B-site ordered double-perovskite (DP) oxides, A_2B'B''O_6, including the prototype Sr_2FeMoO_6 compound are the most promising candidates for room-temperature (RT) low-field (LF) application. The B-site ordered DPs were also in the central role in the present project, though related perovskite-derived systems were investigated as well. The goal of the project was to search for the limits of these materials to function as RT-LF-TMR materials by means of controlling their intrinsic and extrinsic material characteristics. The research included the following aspects:
(i) Tailoring of atomic-level intrinsic characteristics of Sr_2FeMoO_6 and related DP oxides
(ii) Control of the size of grains/magnetic domains by the choice of synthesis conditions
(iii) Design of composite structures to enhance the RT-LF TMR characteristics
(iv) Search for novel HM compound(s) among perovskite oxides
Our unique (new) material design and tailoring scheme itself, comprising atomic-to-macroscopic dimensional manipulation of various intrinsic and extrinsic material parameters, turned out to be highly successful. We positively believe that our approach will be found useful in future too to achieve a more organized and highly productive design scheme for a wide range of frontier materials.

Report

(4 results)
  • 2005 Annual Research Report   Final Research Report Summary
  • 2004 Annual Research Report
  • 2003 Annual Research Report
  • Research Products

    (147 results)

All 2006 2005 2004 2003 Other

All Journal Article (127 results) Book (8 results) Patent(Industrial Property Rights) (3 results) Publications (9 results)

  • [Journal Article] Systematic studies on effects of cationic ordering on structural and magnetic properties in Sr_2FeMoO_62006

    • Author(s)
      Y.H.Huang, M.Karppinen, H.Yamauchi, J.B.Goodenough
    • Journal Title

      Physical Review B 73

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Electron-doping through La^III-for-Sr^II substitution in (Sr_1-xLa_x)_2FeTaO_6 : Effects on the valences and ordering of the B-site cations, Fe and Ta2006

    • Author(s)
      E.-L.Rautama, T.S.Chan, R.S.Liu, J.M.Chen, H.Yamauchi, M.Karppinen
    • Journal Title

      Journal of Solid State Chemistry 179

      Pages: 111-116

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Highly cation-deficient manganese perovskite, La_1-xMn_1-yO_3 with x=y2006

    • Author(s)
      H.Okamoto, H.Fjellvag, H.Yamauchi, M.Karppinen
    • Journal Title

      Solid State Communications 137

      Pages: 522-527

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Crystal and magnetic structure of the orthorhombic perovskite YbMnO_32006

    • Author(s)
      Y.H.Huang, H.Fjellvag, M.Karppinen, B.C.Hauback, H.Yamauchi, J.B.Goodenough
    • Journal Title

      Chemistry of Materials 18

      Pages: 2130-2134

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Transport and magnetotransport properties across the two-step Verwey transition in BaGdFe_2O_5+w2006

    • Author(s)
      J.Linden, P.Karen, J.Nakamura, M.Karppinen, H.Yamauchi
    • Journal Title

      Physical Review B 73

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Parent of misfit-layered cobalt oxides : [Sr_2O_2]_qCoO_22006

    • Author(s)
      H.Yamauchi, K.Sakai, T.Nagai, Y.Matsui, M.Karppinen
    • Journal Title

      Chemistry of Materials 18

      Pages: 155-158

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Oxygen nonstoichiometry in YBaCo_4O_7+δ : Large low-temperature oxygen absorption/desorption capability2006

    • Author(s)
      M.Karppinen, H.Yamauchi, S.Otani, T.Fujita, T.Motohashi, Y.-H.Huang, M.Valkeapaa, H.Fjellvag
    • Journal Title

      Chemistry of Materials 18

      Pages: 490-494

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Hole-doping into Co-12s2 copper oxides with s fluorite-structured layers between CuO_2 planes2006

    • Author(s)
      H.Fjellvag, Y.Morita, T.Nagai, J.M.Lee, J.M.Chen, R.S.Liu, B.C.Hauback, V.P.S.Awana, Y.Matsui, H.Yamauchi, M.Karppinen
    • Journal Title

      Journal of Solid State Chemistry 179

      Pages: 632-645

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Superconductivity in the "triple-fluorite-layer" copper oxides (Cu,M)-1232(M=Mo,W,Re.Pb)2006

    • Author(s)
      I.Grigoraviciute, M.Arai, H.Yamauchi, M.Karppinen
    • Journal Title

      Solid State Communication 137

      Pages: 601-605

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Pinning characteristics at high fields in superconducting Bi-2223 single crystals2006

    • Author(s)
      I.Kohno, M.Kiuchi, E.S.Otabe, T.Matsushita, T.Nomura, T.Motohashi, M.Karppinen, H.Yamauchi, S.Okayasu
    • Journal Title

      Physica C (in press)

    • NAID

      10016931588

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Crystal structure of the parent misfit-layered cobalt oxide [Sr_2O_2]_qCoO_22006

    • Author(s)
      T.Nagai, K.Sakai, M.Karppinen, T.Asaka, K.Kimoto, H.Yamauchi, Y.Matsui
    • Journal Title

      Journal of Solid State Chemistry (in press)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Pb-for-Bi substitution for enhancing thermoelectric characteristics of [(Bi,Pb)_2Ba_2O_4+ω]_0.5CoO_22006

    • Author(s)
      K.Sakai, M.Karppinen, J.M.Chen, R.S.Liu, S.Sugihara, H.Yamauchi
    • Journal Title

      Applied Physics Letters (in press)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Electron-doping through La^<III>-for-Sr^<II> substitution in (Sr_<1-x>La_x)_2FeTaO_6 : Effects on the valences and ordering of the B-site cations, Fe and Ta2006

    • Author(s)
      E.-L.Rautama, T.S.Chan, R.S.Liu, J.M.Chen, H.Yamauchi, M.Karppinen
    • Journal Title

      Journal of Solid State Chemistry 179

      Pages: 111-116

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Highly cation-deficient manganese perovskite, La_<1-x>Mn_<1-y>O_3 with x=y2006

    • Author(s)
      H.Okamoto, H.Fjellvag, H.Yamauchi, M.Karppinen
    • Journal Title

      Solid State Communications 137

      Pages: 522-527

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Transport and magnetotransport properties across the two-step Verwey transition in BaGdFe_2O_<5+w>2006

    • Author(s)
      J.Linden, P.Karen, J.Nakamura, M.Karppinen, H.Yamauchi
    • Journal Title

      Physical Review B 73

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Parent of misfit-layered cobalt oxides : [Sr_2O_2]qCoO_22006

    • Author(s)
      H.Yamauchi, K.Sakai, T.Nagai, Y.Matsui, M.Karppinen
    • Journal Title

      Chemistry of Materials 18

      Pages: 155-158

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Oxygen nonstoichiometry in YBaCo_4O_<7+δ> : Large low-temperature oxygen absorption/desorption capability2006

    • Author(s)
      M.Karppinen, H.Yamauchi, S.Otani, T.Fujita, T.Motohashi, Y.-H.Huang, M.Valkeapaa, H.Fjellvag
    • Journal Title

      Chemistry of Materials 18

      Pages: 490-494

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Annual Research Report 2005 Final Research Report Summary
  • [Journal Article] Superconductivity in the "triple-fluorite-layer" copper oxides (Cu,M)-1232 (M=Mo,W,Re,Pb)2006

    • Author(s)
      I.Grigoraviciute, M.Arai, H.Yamauchi, M.Karppinen
    • Journal Title

      Solid State Communication 137

      Pages: 601-605

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Crystal structure of the parent misfit-layered cobalt oxide [Sr_2O_2]qCoO_22006

    • Author(s)
      T.Nagai, K.Sakai, M.Karppinen, T.Asaka, K.Kimoto, H.Yamauchi, Y.Matsui
    • Journal Title

      Journal of Solid State Chemistry (in press)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Pb-for-Bi substitution for enhancing thermoelectric characteristics of [(Bi,Pb)_2Ba_2O_<4±ω>]<0.5>CoO_22006

    • Author(s)
      K.Sakai, M.Karppinen, J.M.Chen, R.S.Liu, S.Sugihara, H.Yamauchi
    • Journal Title

      Applied Physics Letters (in press)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Large low-field magnetoresistance effect in Sr_2FeMoO_6 homocomposites2005

    • Author(s)
      Y.H.Huang, J.Linden, H.Yamauchi, M.Karppinen
    • Journal Title

      Applied Physics Letters 86

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary 2004 Annual Research Report
  • [Journal Article] Effect of high-pressure annealing on magnetoresistance in manganese perovskites2005

    • Author(s)
      Y.H.Huang, M.Karppinen, H.Yamauchi, J.B.Goodenough
    • Journal Title

      Journal of Applied Physics 98

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Annual Research Report 2005 Final Research Report Summary
  • [Journal Article] New water-containing phase derived from the Sr_3Fe_2O_7-δ phase of Ruddlesden-Popper structure2005

    • Author(s)
      M.Matvejeff, M.Lehtimaki, A.Hirasa, Y.-H.Huang, H.Yamauchi, M.Karppinen
    • Journal Title

      Chemistry of Materials 17

      Pages: 2775-2779

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Oxygen nonstoichiometry and actual Co valence in Na_xCoO_2-δ2005

    • Author(s)
      M.Karppinen, I.Asako, T.Motohashi, H.Yamauchi
    • Journal Title

      Physical Review B 71

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Oxygen nonstoichiometry and valence of copper in the Cu-1222 superconductor2005

    • Author(s)
      M.Karppinen, M.Arai, J.M.Lee, T.S.Chan, Y.Morita, J.M.Chen, R.S.Liu, H.Yamauchi
    • Journal Title

      Journal of Solid State Chemistry 178

      Pages: 1705-1711

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Chemical control of high-T_c superconductivity of the triple-fluorite-layer copper oxide (Cu,Mo)Sr_2(Ce,R)_3Cu_2O_11+δ(R=Y,La-Yb)2005

    • Author(s)
      M.Karppinen, Y.Morita, J.M.Chen, R.S.Liu, H.Yamauchi
    • Journal Title

      Physical Review B 72

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Enhancement in thermoelectric characteristics of the misfit-layered cobalt oxide, [(Bi,Pb)_2Ba_1.8Co_0.2O_±ω]_0.5CoO_2, through Pb-for-Bi substitution2005

    • Author(s)
      K.Sakai, T.Motohashi, M.Karppinen, H.Yamauchi
    • Journal Title

      Thin Solid Films 486

      Pages: 58-62

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Systematic induction of superconductivity in the Cu(Y_1-xCa_x)Ba_2Cu_2O_6+δ(δ【approximately equal】0.3) system by Ca substitution2005

    • Author(s)
      V.P.S.Awana, M.A.Ansari, R.Nigam, A.Gupta, S.B.Samanta, R.B.Saxena, H.Kishan, V.Ganesan, A.V.Narlikar, M.Arai, M.Karppinen, H.Yamauchi, D.Buddhikot, S.K.Malik
    • Journal Title

      Superconductor Science and Technology 18

      Pages: 716-720

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Room-temperature ferromagnetism in Sr_1-xY_xCoO_3-δ(0.2【less than or equal】x【less than or equal】0.25)2005

    • Author(s)
      W.Kobayashi, S.Ishiwata, I.Terasaki, M.Takano, I.Grigoraviciute, H.Yamauchi, M.Karppinen
    • Journal Title

      Physical Review B 72

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] An efficient technique for growing (Bi,Pb)-2223 single crystals2005

    • Author(s)
      T.Nomura, T.Motohashi, S.Lee, M.Karppinen, H.Yamauchi
    • Journal Title

      Physica C 426-431

      Pages: 505-509

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Annual Research Report 2005 Final Research Report Summary
  • [Journal Article] Hole doping and superconductivity characteristics of the s=1,2 and 3 members of the (Cu,Mo)-12s2 homologous series of layered copper oxides2005

    • Author(s)
      M.Karppinen, Y.Morita, T.Kobayashi, I.Grigoraviciute, J.M.Chen, R.S.Liu, H.Yamauchi
    • Journal Title

      Journal of Solid State Chemistry 178

      Pages: 3464-3470

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] New water-containing phase derived from the Sr_3Fe_2O_<7-δ> phase of Ruddlesden-Popper structure2005

    • Author(s)
      M.Matvejeff, M.Lehtimaki, A.Hirasa, Y.-H.Huang, H.Yamauchi, M.Karppinen
    • Journal Title

      Chemistry of Materials 17

      Pages: 2775-2779

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Oxygen nonstoichiometry and actual Co valence in Na_xCoO_<2-δ>2005

    • Author(s)
      M.Karppinen, I.Asako, T.Motohashi, H.Yamauchi
    • Journal Title

      Physical Review B 71

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Annual Research Report 2005 Final Research Report Summary
  • [Journal Article] Chemical control of high-T_c superconductivity of the triple-fluorite-layer copper oxide (Cu,Mo)Sr_2(Ce,R)_3Cu_2O_<11+δ> (R = Y,La - Yb)2005

    • Author(s)
      M.Karppinen, Y.Morita, J.M.Chen, R.S.Liu, H.Yamauchi
    • Journal Title

      Physical Review B 72

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Enhancement in thermoelectric characteristics of the misfit-layered cobalt oxide, [(Bi,Pb)_2Ba_<1.8>Co_<0.2>O_<4±ω>]_<0.5>CoO_2, through Pb-for-Bi substitution2005

    • Author(s)
      K.Sakai, T.Motohashi, M.Karppinen, H.Yamauchi
    • Journal Title

      Thin Solid Films 486

      Pages: 58-62

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Systematic induction of superconductivity in the Cu(Y_<1-x>Ca_x)Ba_2Cu_2O<6+δ> (δ 【approximately equal】 0.3) system by Ca substitution2005

    • Author(s)
      V.P.S.Awana, M.A.Ansari, R.Nigam, A.Gupta, S.B.Samanta, R.B.Saxena, H.Kishan, V.Ganesan, A.V.Narlikar, M.Arai, M.Karppinen, H.Yamauchi, D.Buddhikot, S.K.Malik
    • Journal Title

      Superconductor Science and Technology 18

      Pages: 716-720

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Room-temperature ferromagnetism in Sr_<1-x>Y_xCoO_<3-δ> (0.2【less than or equal】x【less than or equal】0.25)2005

    • Author(s)
      W.Kobayashi, S.Ishiwata, I.Terasaki, M.Takano, I.Grigoraviciute, H.Yamauchi, M.Karppinen
    • Journal Title

      Physical Review B 72

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Hole doping and superconductivity characteristics of the s = 1,2 and 3 members of the (Cu,Mo)-12s2 homologous series of layered copper oxides2005

    • Author(s)
      M.Karppinen, Y.Morita, T.Kobayashi, I.Grigoraviciute, J.M.Chen, R.S.Liu, H.Yamauchi
    • Journal Title

      Journal of Solid State Chemistry 178

      Pages: 3464-3470

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Large low-field magnetoresistance effect Sr_2FeMoO_6 homocomposites2005

    • Author(s)
      Y.H.Huang, J.Linden, H.Yamauchi, M.Karppinen
    • Journal Title

      Applied Physics Letters 86

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Room-temperature ferromagnetism in Sr_<1-x>Y_xCoO_<3-δ>(0.2【less than or equal】x【less than or equal】0.25)2005

    • Author(s)
      W.Kobayashi, S.Ishiwata, I.Terasaki, M.Takano, I.Grigoraviciute, H.Yamauchi, M.Karppinen
    • Journal Title

      Physical Review B 72

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Oxygen nonstoichiometry and actual Co valence in Na_xCoO_<2-δ>2005

    • Author(s)
      M.Karppinen, I.Asako, T.Motohashi, H.Yamauchi
    • Journal Title

      Physical Review B (in press)

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Simple and efficient route to prepare homogenous samples of Sr_2FeMoO_6 with a high degree of Fe/Mo order2004

    • Author(s)
      Y.H.Huang, J.Linden, H.Yamauchi, M.Karppinen
    • Journal Title

      Chemistry of Materials 16

      Pages: 4337-4342

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary 2004 Annual Research Report
  • [Journal Article] Iron valence in double-perovskite (Ba,Sr,Ca)_2FeMoO_6 : isovalent substitution effect2004

    • Author(s)
      Y.Yasukawa, J.Linden, T.S.Chan, R.S.Liu, H.Yamauchi, M.Karppinen
    • Journal Title

      Journal of Solid State Chemistry 177

      Pages: 2655-2662

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary 2004 Annual Research Report
  • [Journal Article] ^57Fe Mossbauer spectroscopy investigation of the Fe^II/III mixed-valence state and the B-site order in double perovskite A_2FeMoO_62004

    • Author(s)
      J.Linden, H.Yamauchi, M.Karppinen
    • Journal Title

      Journal of Magnetism and Magnetic Materials 272-276

      Pages: 843-844

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Oxygen and cation ordered perovskite, Ba_2Y_2Mn_4O_112004

    • Author(s)
      M.Karppinen, H.Okamoto, H.Fjellvag, T.Motohashi, H.Yamauchi
    • Journal Title

      Journal of Solid State Chemistry 177

      Pages: 2122-2128

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Isovalent substitution effect on the Verwey-type transition in the A-site ordered double perovskite (Ba,Sr)RFe_2O_52004

    • Author(s)
      J.Nakamura, M.Karppinen, P.Karen, J.Linden, H.Yamauchi
    • Journal Title

      Physical Review B 70

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Pressure effects on the charge-ordering transition of BaYCo_2O_5.02004

    • Author(s)
      Y.Moritomo, M.Hanawa, S.Xu, H.Ishikawa, Y.Ohishi, K.Kato, T.Honma, P.Karen, M.Karppinen, H.Yamauchi
    • Journal Title

      Physical Review B 69

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Space-group determination of the BaY(Cu_0.5Fe_0.5)_2O_5+δ phase using a convergent-beam electron-diffraction technique2004

    • Author(s)
      H.Suematsu, J.Linden, M.Nagase, Y.Tomokiyo, M.Karppinen, H.Yamauchi
    • Journal Title

      Journal of Solid State Chemistry 177

      Pages: 1958-1964

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Valence mixing, separation and ordering in double-cell perovskite GdBaFe_2O_5+w2004

    • Author(s)
      J.Linden, P.Karen, H.Yamauchi, M.Karppinen
    • Journal Title

      Journal of Magnetism and Magnetic Materials 272-276

      Pages: 267-268

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Exploring the Verwey-type transition in GdBaFe_2O_5+w using ^57Fe Mossbauer spectroscopy2004

    • Author(s)
      J.Linden, P.Karen, H.Yamauchi, M.Karppinen
    • Journal Title

      Hyperfine Interactions 156,

      Pages: 321-325

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Oxygen nonstoichiometry and magnetotransport properties of Sr_2(Y_1-xCa_x)Co_2O_7+δ cobalt oxides2004

    • Author(s)
      M.Matvejeff, J.Nakamura, H.Yamauchi, M.Karppinen
    • Journal Title

      Materials Chemistry and Physics 85

      Pages: 329-333

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Oxidation state of cobalt in the Na_xCoO_2-δ ・y H_2O superconductor2004

    • Author(s)
      M.Karppinen, I.Asako, T.Motohashi, H.Yamauchi
    • Journal Title

      Chemistry of Materials 16

      Pages: 1693-1696

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Hole concentration in the three-CuO_2-plane copper-oxide superconductor Cu-12232004

    • Author(s)
      M.Karppinen, H.Yamauchi, Y.Morita, M.Kitabatake, T.Motohashi, R.S.Liu, J.M.Lee, J.M.Chen
    • Journal Title

      Journal of Solid State Chemistry 177

      Pages: 1037-1043

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Effect of Sr-for-Ba isovalent substitution on the local structure, hole distribution and magnetic irreversibility of Cu(Ba,Sr)_2YbCu_2O_6.95(2)2004

    • Author(s)
      T.Nakane, K.Isawa, R.S.Liu, J.M.Chen, H.Yamauchi, M.Karppinen
    • Journal Title

      Journal of Solid State Chemistry 177

      Pages: 1925-1932

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Evidence for oxygen vacancies in misfit-layered calcium cobalt oxide, [CoCa_2O_3]_qCoO_22004

    • Author(s)
      M.Karppinen, H.Fjellvag, T.Konno, Y.Morita, T.Motohashi, H.Yamauchi
    • Journal Title

      Chemistry of Materials 16

      Pages: 2790-2793

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary 2004 Annual Research Report
  • [Journal Article] Structural and magnetic properties of MSr_2Y_1.5Ce_0.5Cu_2O_z(M-1222) compounds with M=Fe and Co2004

    • Author(s)
      V.P.S.Awana, A.Gupta, H.Kishan, S.K.Malik, W.B.Yelon, J.Linden, M.Karppinen, H.Yamauchi, D.C.Kundaliya
    • Journal Title

      Journal of Applied Physics 95

      Pages: 6690-6692

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Investigation of spin-glass behavior in the LnRu-1222(Ln=Gd, Dy, Ho, Y)system2004

    • Author(s)
      C.A.Cardoso, F.M.Araujo-Moreira, V.P.S.Awana, E.Takayama-Muromachi, O.F.de Lima, H.Yamauchi, M.Karppinen
    • Journal Title

      Physica C 408-410

      Pages: 183-184

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Oxygen nonstoichiometry and cobalt valence in misfit-layered cobalt oxides2004

    • Author(s)
      Y.Morita, J.Poulsen, K.Sakai, T.Motohashi, T.Fujii, I.Terasaki, H.Yamauchi, M.Karppinen
    • Journal Title

      Journal of Solid State Chemistry 177

      Pages: 3150-3156

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary 2004 Annual Research Report
  • [Journal Article] Micro-structure and magnetization of the 80-K superconductor, TbSr_2Cu_2.7Mo_0.3O_7+δ2004

    • Author(s)
      V.P.S.Awana, A.Gupta, H.Kishan, M.Karppinen, H.Yamauchi, A.V.Narlikar, E.Galstyan, I.Felner
    • Journal Title

      Physica C 415

      Pages: 69-73

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] High-T_c superconductivity in three-fluorite-layer copper oxides.I.(Hg,W)Sr_2(Ce,Eu)_3Cu_2O_11+δ2004

    • Author(s)
      T.Watanabe, M.Karppinen, T.Motohashi, T.Nagai, Y.Matsui, H.Yamauchi
    • Journal Title

      Physical Review B 70

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] High-T_c superconductivity in three-fluorite-layer copper oxides.II.(Cu,Mo)Sr_2(Ce,Y)_3Cu_2O_11+δ2004

    • Author(s)
      Y.Morita, T.Nagai, Y.Matsui, H.Yamauchi, M.Karppinen
    • Journal Title

      Physical Review B 70

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Magnetism in Na_0.75CoO_2 investigated by μSR2004

    • Author(s)
      J.Sugiyama, H.Itahara, J.H.Brewer, E.J.Ansaldo, T.Motohashi, M.Karppinen, H.Yamauchi
    • Journal Title

      Transact.Mater.Res.Soc.Jpn. 29

      Pages: 2745-2748

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Thermoelectric misfit-layered cobalt oxides (I) : oxygen nonstoichiometry and cobalt valence2004

    • Author(s)
      Y.Morita, K.Sakai, I.Asako, T.Konno, T.Motohashi, S.Sgihara, T.Fujii, I.Terasaki, H.Yamauchi, M.Karppinen
    • Journal Title

      Transact.Mater.Res.Soc.Jpn. 29

      Pages: 2749-2752

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Thermoelectric misfit-layered cobalt oxides (II) : Properties of oxygen-controlled samples of Ca_3Co_3.95O_9+δ2004

    • Author(s)
      T.Motohashi, T.Konno, T.Aoyama, M.Karppinen, H.Yamauchi
    • Journal Title

      Transact.Mater.Res.Soc.Jpn. 29

      Pages: 2753-2756

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] ^<57>Fe Mossbauer spectroscopy investigation of the Fe^_<II/III> mixed-valence state and the B-site order in double perovskite A_2FeMoO_62004

    • Author(s)
      J.Linden, H.Yamauchi, M.Karppinen
    • Journal Title

      Journal of Magnetism and Magnetic Materials 272-276

      Pages: 843-844

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Oxygen and cation ordered perovskite, Ba_2Y_2Mn_4O_<11>2004

    • Author(s)
      M.Karppinen, H.Okamoto, H.Fjellvag, T.Motohashi, H.Yamauchi
    • Journal Title

      Journal of Solid State Chemistry 177

      Pages: 2122-2128

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Pressure effects on the charge-ordering transition of BaYCo_2O_<5.0>2004

    • Author(s)
      Y.Moritomo, M.Hanawa, S.Xu, H.Ishikawa, Y.Ohishi, K.Kato, T.Honma, P.Karen, M.Karppinen, H.Yamauchi
    • Journal Title

      Physical Review B 69

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Space-group determination of the BaY(Cu_<0.5>Fe_<0.5>)_2O_<5+δ> phase using a convergent-beam electron-diffraction technique2004

    • Author(s)
      H.Suematsu, J.Linden, M.Nagase, Y.Tomokiyo, M.Karppinen, H.Yamauchi
    • Journal Title

      Journal of Solid State Chemistry 177

      Pages: 1958-1964

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Valence mixing separation and ordering in double-cell perovskite GdBaFe_2O_<5+w>2004

    • Author(s)
      J.Linden, P.Karen, H.Yamauchi, M.Karppinen
    • Journal Title

      Journal of Magnetism and Magnetic Materials 272-276

      Pages: 267-268

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Exploring the Verwey-type transition in GdBaFe_2O_<5+w> using ^<57>Fe Mossbauer spectroscopy2004

    • Author(s)
      J.Linden, P.Karen, H.Yamauchi, M.Karppinen
    • Journal Title

      Hyperfine Interactions 156

      Pages: 321-325

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Oxygen nonstoichiometry and magnetotransport properties of Sr_2(Y_<1-x>Ca_x)Co_2O_<7+δ> cobalt oxides2004

    • Author(s)
      M.Matvejeff, J.Nakamura, H.Yamauchi, M.Karppinen
    • Journal Title

      Materials Chemistry and Physics 85

      Pages: 329-333

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary 2004 Annual Research Report
  • [Journal Article] Oxidation state of cobalt in the Na_xCoO_<2-δ>・y H_2O superconductor2004

    • Author(s)
      M.Karppinen, I.Asako, T.Motohashi, H.Yamauchi
    • Journal Title

      Chemistry of Materials 16

      Pages: 1693-1696

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Electron microscope studies of nano-domain structures in Ru-based magneto-superconductors : RuSr_2Gd_<1.5>Ce_<0.5>Cu_2O_<10-δ> (Ru-1222) and RuSr_2GdCu_2O_8 (Ru-1212)2004

    • Author(s)
      T.Yokosawa, V.P.S.Awana, K.Kimoto, E.Takayama-Muromachi, M.Karppinen, H.Yamauchi, Y.Matsui
    • Journal Title

      Ultramicroscopy 98

      Pages: 283-295

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Effect of Sr-for-Ba isovalent substitution on the local structure, hole distribution and magnetic irreversibility of Cu(Ba,Sr)_2YbCu_2O_<6.95>(2)2004

    • Author(s)
      T.Nakane, K.Isawa, R.S.Liu, J.M.Chen, H.Yamauchi, M.Karppinen
    • Journal Title

      Journal of Solid State Chemistry 177

      Pages: 1925-1932

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Structural and magnetic properties of MSr_2Y_<1.5>Ce_<0.5>Cu_2O_z (M-1222) compounds with M = Fe and Co2004

    • Author(s)
      V.P.S.Awana, A.Gupta, H.Kishan, S.K.Malik, W.B.Yelon, J.Linden, M.Karppinen, H.Yamauchi, D.C.Kundaliya
    • Journal Title

      Journal of Applied Physics 95

      Pages: 6690-6692

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Investigation of spin-glass behavior in the LnRu-1222 (Ln = Gd,Dy,Ho,Y) system2004

    • Author(s)
      C.A.Cardoso, F.M.Araujo-Moreira, V.P.S.Awana, E.Takayama-Muromachi, O.F.de Lima, H.Yamauchi, M.Karppinen
    • Journal Title

      Physica C 408-410

      Pages: 183-184

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Micro-structure and magnetization of the 80-K superconductor, TbSr_2Cu_<2.7>Mo_<0.3>O_<7+δ>2004

    • Author(s)
      V.P.S.Awana, A.Gupta, H.Kishan, M.Karppinen, H.Yamauchi, A.V.Narlikar, E.Galstyan, I.Felner
    • Journal Title

      Physica C 415

      Pages: 69-73

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] High-T_c superconductivity in three-fluorite-layer copper oxides. I. (Hg,W)Sr_2(Ce,Eu)_3Cu_2O<11+δ>2004

    • Author(s)
      T.Watanabe, M.Karppinen, T.Motohashi, T.Nagai, Y.Matsui, H.Yamauchi
    • Journal Title

      Physical Review B 70

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] High-T_c superconductivity in three-fluorite-layer copper oxides. II. (Cu,Mo)Sr_2(Ce,Y)_3Cu_2O_<11+δ>2004

    • Author(s)
      Y.Morita, T.Nagai, Y.Matsui, H.Yamauchi, M.Karppinen
    • Journal Title

      Physical Review B 70

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Magnetism in Na_<0.75>CoO_2 investigated by μSR2004

    • Author(s)
      J.Sugiyama, H.Itahara, J.H.Brewer, E.J.Ansaldo, T.Motohashi, M.Karppinen, H.Yamauchi
    • Journal Title

      Transact.Mater.Res.Soc.Jpn 29

      Pages: 2745-2748

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Thermoelectric misfit-layered cobalt oxides (I) : oxygen nonstoichiometry and cobalt valence2004

    • Author(s)
      Y.Morita, K.Sakai, I.Asako, T.Konno, T.Motohashi, S.Sugihara, T.Fujii, I.Terasaki, H.Yamauchi, M.Karppinen
    • Journal Title

      Transact.Mater.Res.Soc.Jpn. 29

      Pages: 2749-2752

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Thermoelectric misfit-layered cobalt oxides (II) : Properties of oxygen-controlled samples of Ca_3Co_<3.95>O_<9+δ>2004

    • Author(s)
      T.Motohashi, T.Konno, T.Aoyama, M.Karppinen, H.Yamauchi
    • Journal Title

      Transact.Mater.Res.Soc.Jpn. 29

      Pages: 2753-2756

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Hole concentration in the three-CuO_2-plane copper-oxide supercondctor Cu-12232004

    • Author(s)
      M.Karppinen, H.Yamauchi, Y.Morita, M.Kitabatake, T.Motohashi, R.S.Liu, J.M.Lee, J.M.Chen
    • Journal Title

      Journal of Solid State Chemistry 177

      Pages: 1037-1043

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Effect of Sr-for-Ba isovalent substitution on the local structure, hole distribution and magnetic irreversibility of Cu(Ba,Sr)_2YbCu_2O_<6.95>2004

    • Author(s)
      T.Nakane, K.Isawa, R.S.Liu, J.M.Chen, H.Yamauchi, M.Karppinen
    • Journal Title

      Journal of Solid State Chemistry 177

      Pages: 1925-1932

    • Related Report
      2004 Annual Research Report
  • [Journal Article] ^<57>Fe Mossbauer spectroscopy investigation of the Fe^<II/III> mixed-valence state and the B-site order in double perovskite A_2FeMoO_62004

    • Author(s)
      J.Linden, H.Yamauchi, M.Karppinen
    • Journal Title

      Journal of Magnetism and Magnetic Materials 272-276

      Pages: 843-844

    • Related Report
      2004 Annual Research Report
  • [Journal Article] High-T_c superconductivity in three-fluorite-layer copper oxides. II. (Cu,Mo)Sr_2(Ce,Y)_3Cu_2O_<11+δ>2004

    • Author(s)
      Y.Morita, T.Nagai, Y.Matsui, H.Yamauchi, M.Karppine
    • Journal Title

      Physical Review B 70

      Pages: 174515-174520

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Valence state of iron in the Sr_2Fe(Mo,W,Ta)O_6.0 double-perovskite system : an Fe K-edge and L_2,3-edge XANES study2003

    • Author(s)
      M.Karppinen, H.Yamauchi, Y.Yasukawa, J.Linden, T.S.Chan, R.S.Liu, J.M.Chen
    • Journal Title

      Chemistry of Materials 15

      Pages: 4118-4121

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Kinetics and thermodynamics of the degree of order of the B cations in double-perovskite Sr_2FeMoO_62003

    • Author(s)
      T.Shimada, J.Nakamura, T.Motohashi, H.Yamauchi, M.Karppinen
    • Journal Title

      Chemistry of Materials 15

      Pages: 4494-4497

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Observation of antiphase boundaries in Sr_2FeMoO_62003

    • Author(s)
      J.Linden, M.Karppinen, T.Shimada, Y.Yasukawa, H.Yamauchi
    • Journal Title

      Physical Review B 68

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Iron and molybdenum valences in double-perovskite (Sr,Nd)_2FeMoO_6 : electron-doping effect2003

    • Author(s)
      J.Linden, T.Shimada, T.Motohashi, H.Yamauchi, M.Karppinen
    • Journal Title

      Solid State Communications 129

      Pages: 129-133

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Physical pressure effect on the charge-ordering transition of BaSmFe_2O_5.02003

    • Author(s)
      Y.Moritomo, M.Hanawa, Y.Ohishi, K.Kato, J.Nakamura, M.Karppinen, H.Yamauchi
    • Journal Title

      Physical Review B 68

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Layer-specific hole concentrations in Bi_2Sr_2(Y_1-xCa_x)Cu_2O_8+δ as probed by XANES spectroscopy and coulometric redox analysis2003

    • Author(s)
      M.Karppinen, K.Kotiranta, T.Nakane, S.C.Chang, J.M.Chen, R.S.Liu, H.Yamauchi
    • Journal Title

      Physical Review B 67

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Hole doping in Pb-free and Pb-substituted (Bi,Pb)_2Sr_2Ca_2Cu_3O_10+δ superconductors2003

    • Author(s)
      M.Karppinen, S.Lee, J.M.Lee, J.Poulsen, T.Nomura, S.Tajima, J.M.Chen, R.S.Liu, H.Yamauchi
    • Journal Title

      Physical Review B 68

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Unconventional magnetic transition and transport behavior in Na_0.75CoO_22003

    • Author(s)
      T.Motohashi, R.Ueda, E.Naujalis, T.Tojo, I.Terasaki, T.Atake, M.Karppinen, H.Yamauchi
    • Journal Title

      Physical Review B 67

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Spin glass behavior in RuSr_2Gd_1.5Ce_0.5Cu_2O_10-δ2003

    • Author(s)
      C.A.Cardoso, F.M.Araujo-Moreira, V.P.S.Awana, E.Takayama-Muromachi, O.F.de Lima, H.Yamauchi, M.Karppinen
    • Journal Title

      Physical Review B 67

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Cation intermixing and ordering phenomenon in M-O layer of MSr_2YCu_2O_z(M-1212) compounds with M=Fe, Co, Al, and Ga : a neutron powder diffraction study2003

    • Author(s)
      V.P.S.Awana, E.Takayama-Muromachi, S.K.Malik, W.B.Yelon, M.Karppinen, H.Yamauchi, V.V.Krishnamurthy
    • Journal Title

      Journal of Applied Physics 93

      Pages: 8221-8223

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] XANES study on the evolution among different copper species Cu^I,Cu^IIand Cu^III, in CuBa_2YCu_2O_6+z upon Oxygen Loading2003

    • Author(s)
      Y.Morita, M.Karppinen, H.Yamauchi, R.S.Liu, J.M.Chen
    • Journal Title

      Journal of Low Temperature Physics 131

      Pages: 381-386

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Relationship between local atomic arrangements and properties of high-T_c superconductive copper oxides2003

    • Author(s)
      H.Yamauchi, M.Karppinen
    • Journal Title

      Journal of Low Temperature Physics 131

      Pages: 705-717

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Oxygen content and valence of Ru in RuSr_2(Gd_0.75Ce_0.25)_2Cu_2O_10-δ2003

    • Author(s)
      V.P.S.Awana, M.Karppinen, H.Yamauchi, M.Matvejeff, R.S.Liu, L.-Y.Jang
    • Journal Title

      Journal of Low Temperature Physics 131

      Pages: 1211-1216

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Magneto-superconductivity of 100-atm O_2-annealed RuSr_2Gd_1.5Ce_0.5Cu_2O_10-δ2003

    • Author(s)
      V.P.S.Awana, E.Takayama-Muromachi, M.Karppinen, H.Yamauchi
    • Journal Title

      Physica C 390

      Pages: 233-238

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Static magnetic order in Na_0.75CoO_2 detected by muon spin rotation and relaxation2003

    • Author(s)
      J.Sugiyama, H.Itahara, J.H.Brewer, E.J.Ansaldo, T.Motohashi, M.Karppinen, H.Yamauchi
    • Journal Title

      Physical Review B 67,

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Unconventional electronic transition in Na_xCoO_2 with a precisely controlled Na nonstoichiometry2003

    • Author(s)
      T.Motohashi, R.Ueda, E.Naujalis, T.Tojo, I.Terasaki, T.Atake, M.Karppinen, H.Yamauchi
    • Journal Title

      Physica B 329-333

      Pages: 914-915

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Superconductivity in CoSr_2(Y_1-xCa_x)Cu_2O_7+δ2003

    • Author(s)
      Y.Morita, H.Yamauchi, M.Karppinen
    • Journal Title

      Solid State Communications 127

      Pages: 493-498

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] ZrO_2 thin films grown on silicon substrates by atomic layer deposition with Cp_2Zr(CH_3)_2 and water as precursors2003

    • Author(s)
      M.Putkonen, J.niinisto, K.Kukli, T.Sajavaara, M.Karppinen, H.Yamauchi, L.Niinisto
    • Journal Title

      Chemical Vapor Deposition 9

      Pages: 207-212

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Oxygen stoichiometry in Co-1212, Co-1222 and Co-1232 of the homologous series Co-12s2 of "category-B" layered copper oxides2003

    • Author(s)
      M.Karppinen, V.P.S.Awana, Y.Morita, H.Yamauchi
    • Journal Title

      Physica C 392-396

      Pages: 82-86

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Oxygen non-stoichiometry in Ru-1212 and Ru-1222 magnetosuperconductors2003

    • Author(s)
      M.Matvejeff, V.P.S.Awana, L.-Y.Jang, R.S.Liu, H.Yamauchi, M.Karppinen
    • Journal Title

      Physica C 392-396

      Pages: 87-92

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] XANES and wet-chemical analyses of the charge balance in (Hg,Pb)(Ba,Sr)_2Ca_2Cu_3O_8+δ2003

    • Author(s)
      T.Watanabe, N.Kiryakov, J.Poulsen, J.M.Lee, J.M.Chen, R.S.Liu, H.Yamauchi, M.Karppinen
    • Journal Title

      Physica C 392-396

      Pages: 93-98

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Structural order and disorder in Co-based layered cuprates CoSr_2(Y,Ce)_sCu_2O_5+2s(s=1-3)2003

    • Author(s)
      T.Nagai, V.P.S.Awana, E.Takayama-Muromachi, A.Yamazaki, M.Karppinen, H.Yamauchi, S.K.Malik, W.B.Yelon, Y.Matsui
    • Journal Title

      Journal of Solid State Chemistry 176

      Pages: 213-220

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Superconductivity with transition temperature up to 80 K for TbSr_2Cu_2.7Mo_0.3O_7+δ2003

    • Author(s)
      V.P.S.Awana, A.Gupta, H.Kishan, E.Takayama-Muromachi, T.Watanabe, M.Karppinen, H.Yamauchi, S.K.Malik, W.B.Yelon, V.Ganesan, A.V.Narlikar
    • Journal Title

      Solid State Communications 129

      Pages: 117-121

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Whisker crystals of Na_xCoO_2 : growth and properties2003

    • Author(s)
      G.Peleckis, T.Motohashi, M.Karppinen, H.Yamauchi
    • Journal Title

      Applied Physics Letters 83

      Pages: 5416-5418

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Valence state of iron in the Sr_2Fe(Mo,W,Ta)O_<6.0> double-perovskite system : an Fe K-edge and L_<2,3>-edge XANES study2003

    • Author(s)
      M.Karppinen, H.Yamauchi, Y.Yasukawa, J.Linden, T.S.Chan, R.S.Liu, J.M.Chen
    • Journal Title

      Chemistry of Materials 15

      Pages: 4118-4121

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Physical pressure effect on the charge-ordering transition of BaSmFe_2O_<5.0>2003

    • Author(s)
      Y.Moritomo, M.Hanawa, Y.Ohishi, K.Kato, J.Nakamura, M.Karppinen, H.Yamauchi
    • Journal Title

      Physical Review B 68

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Layer-specific hole concentrations in Bi_2Sr_2(Y_<1-x>Ca_x)Cu_2O<8+δ> as probed by XANES spectroscopy and coulometric redox analysis2003

    • Author(s)
      M.Karppinen, K.Kotiranta, T.Nakane, S.C.Chang, J.M.Chen, R.S.Liu, H.Yamauchi
    • Journal Title

      Physical Review B 67

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Hole doping in Pb-free and Pb-substituted (Bi,Pb)_2Sr_2Ca_2Cu_3O_<10+δ> superconductors2003

    • Author(s)
      M.Karppinen, S.Lee, J.M.Lee, J.Poulsen, T.Nomura, S.Tajima, J.M.Chen, R.S.Liu, H.Yamauchi
    • Journal Title

      Physical Review B 68

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Unconventional magnetic transition and transport behavior in Na_<0.75>CoO_22003

    • Author(s)
      T.Motohashi, R.Ueda, E.Naujalis, T.Tojo, I.Terasaki, T.Atake, M.Karppinen, H.Yamauchi
    • Journal Title

      Physical Review B 67

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Spin glass behavior in RuSr_2Gd<1.5>Ce_<0.5>Cu_2O_<10+δ>2003

    • Author(s)
      C.A.Cardoso, F.M.Araujo-Moreira, V.P.S.Awana, E.Takayama-Muromachi, O.F.de Lima, H.Yamauchi, M.Karppinen
    • Journal Title

      Physical Review B 67

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Cation intermixing and ordering phenomenon in M-O layer of MSr_2YCu_2O_z (M-1212) compounds with M=Fe,Co,Al, and Ga : a neutron powder diffraction study2003

    • Author(s)
      V.P.S.Awana, E.Takayama-Muromachi, S.K.Malik, W.B.Yelon, M.Karppinen, H.Yamauchi, V.V.Krishnamurthy
    • Journal Title

      Journal of Applied Physics 93

      Pages: 8221-8223

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] XANES study on the evolution among different copper species, Cu^I,Cu^II and Cu^III, in CuBa_2YCu_2O_<6+z> upon Oxygen Loading2003

    • Author(s)
      Y.Morita, M.Karppinen, H.Yamauchi, R.S.Liu, J.M.Chen
    • Journal Title

      Journal of Low Temperature Physics 131

      Pages: 381-386

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Oxygen content and valence of Ru in RuSr_2(Gd_<0.75>Ce_<0.25>)_2Cu_2O_<10-δ>2003

    • Author(s)
      V.P.S.Awana, M.Karppinen, H.Yamauchi, M.Matvejeff, R.S.Liu, L.-Y.Jang
    • Journal Title

      Journal of Low Temperature Physics 131

      Pages: 1211-1216

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Magneto-superconductivity of 100-atm O_2-annealed RuSr_2Gd_<1.5>Ce_<0.5>Cu_2O<10-δ>2003

    • Author(s)
      V.P.S.Awana, E.Takayama-Muromachi, M.Karppinen, H.Yamauchi
    • Journal Title

      Physica C 390

      Pages: 233-238

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Static magnetic order in Na_<0.75>CoO_2 detected by muon spin rotation and relaxation2003

    • Author(s)
      J.Sugiyama, H.Itahara, J.H.Brewer, E.J.Ansaldo, T.Motohashi, M.Karppinen, H.Yamauchi
    • Journal Title

      Physical Review B 67

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Superconductivity in CoSr_2(Y_<1-x>Ca_x)Cu_2O_<7+δ>2003

    • Author(s)
      Y.Morita, H.Yamauchi, M.Karppinen
    • Journal Title

      Solid State Communications 127

      Pages: 493-498

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] ZrO_2 thin films grown on silicon substrates by atomic layer deposition with Cp_2Zr(CH_3)_2 and water as precursors2003

    • Author(s)
      M.Putkonen, J.Niinisto, K.Kukli, T.Sajavaara, M.Karppinen, H.Yamauchi, L.Niinistto
    • Journal Title

      Chemical Vapor Deposition 9

      Pages: 207-212

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Oxygen stoichiometry in Co-1212,Co-1222 and Co-1232 of the homologous series Co-12s2 of "category-B" layered copper oxides2003

    • Author(s)
      M.Karppinen, V.P.S.Awana, Y.Morita, H.Yamauchi
    • Journal Title

      Physica C 392-396

      Pages: 82-86

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] XANES and wet-chemical analyses of the charge balance in (Hg,Pb)(Ba,Sr)_2Ca_2Cu_3O_8+δ>2003

    • Author(s)
      T.Watanabe, N.Kiryakov, J.Poulsen, J.M.Lee, J.M.Chen, R.S.Liu, H.Yamauchi, M.Karppinen
    • Journal Title

      Physica C 392-396

      Pages: 93-98

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Structural order and disorder in Co-based layered cuprates CoSr_2(Y,Ce)_sCu_2O_<5+2s (s =1-3)2003

    • Author(s)
      T.Nagai, V.P.S.Awana, E.Takayama-Muromachi, A.Yamazaki, M.Karppinen, H.Yamauchi, S.K.Malik, W.B.Yelon, Y.Matsui
    • Journal Title

      Journal of Solid State Chemistry 176

      Pages: 213-220

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Superconductivity with transition temperature up to 80 K for TbSr_2Cu_<2.7>Mo_<0.3>O_<7+δ>2003

    • Author(s)
      V.P.S.Awana, A.Gupta, H.Kishan, E.Takayama-Muromachi, T.Watanabe, M.Karppinen, H.Yamauchi, S.K.Malik, W.B.Yelon, V.Ganesan, A.V.Narlikar
    • Journal Title

      Solid State Communications 129

      Pages: 117-121

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Book] Chemistry of halfmetallic and related cation-ordered double perovskites, In : Frontiers in Magnetic Materials (A.V.Narlikar (Ed))2005

    • Author(s)
      M.Karppinen, H.Yamauchi
    • Publisher
      Springer Verlag, Berlin
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Book] Chemical design of copper-oxide superconductors : Homologous series and oxygen engineering, In : Frontiers in Superconducting Materials (A.V.Narlikar (Ed))2005

    • Author(s)
      M.Karppinen, H.Yamauchi
    • Publisher
      Springer Verlag, Berlin
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Book] Frontiers in Superconducting Materials(A.V.Narlikar(Ed))2005

    • Author(s)
      M.Karppinen, H.Yamauchi
    • Total Pages
      40
    • Publisher
      Springer Verlag, Berlin 2005
    • Related Report
      2005 Annual Research Report
  • [Book] Frontiers in Magnetic Materials(A.V.Narlikar(Ed))2005

    • Author(s)
      M.Karppinen, H.Yamauchi
    • Total Pages
      32
    • Publisher
      Springer Verlag, Berlin
    • Related Report
      2005 Annual Research Report
  • [Book] Chemical design of copper-oxide superconductors : Homologous series and oxygen engineering(Frontiers in Superconducting Materials)(A.V.Narlikar (Ed))2005

    • Author(s)
      M.Karppinen, H.Yamauchi
    • Total Pages
      40
    • Publisher
      Springer Verlag
    • Related Report
      2004 Annual Research Report
  • [Book] Chemistry of halfmetallic and related cation-ordered double perovkites(Frontiers in Magnetic Materials)(A.V.Narlikar (Ed))2005

    • Author(s)
      M.Karppinen, H.Yamauchi
    • Total Pages
      32
    • Publisher
      Springer Verlag
    • Related Report
      2004 Annual Research Report
  • [Book] Electron Correlation Functional Materials, In : Molecular Functional Materials and Device Developments in the Nano-IT Era (Nano, IT Jidai no Bunshi Kino Zairyo to Soshi Kaihatsu) (Ed. K.Yoshino) (in Japanese)2004

    • Author(s)
      H.Yamauchi, M.Karppinen, T.Motohashi
    • Publisher
      NTS Publ. (Enu-Ti-Esu), Tokyo
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Book] Magneto-superconductivity in rutheno-cuprates RuSr_2GdCu_O_<8-δ> (Ru-1212) and RuSr_2(Gd_<0.75>Ce_<0.25>)_2Cu_2O_<10-δ> (Ru-1222) : a critical review, In : International Book Series : Studies of High Temperature Superconductors, Vol.46 (A.V.Narlikar (Ed.))2003

    • Author(s)
      V.P.S.Awana, M.Karppinen, H.Yamauchi
    • Publisher
      Nova Science Publishers, New York
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Patent(Industrial Property Rights)] 酸素過剰型金属酸化物及び酸素貯蔵又は酸素選択膜用セラミックス2005

    • Inventor(s)
      カルピネン, マーリット, 山内尚雄, フィエルヴォーグ, ヘルメル, 本橋輝樹
    • Industrial Property Rights Holder
      (財)理工学振興会
    • Industrial Property Number
      2005-192187
    • Filing Date
      2005-06-30
    • Related Report
      2005 Annual Research Report
  • [Patent(Industrial Property Rights)] 熱電変換層状コバルト酸化物とその合成方法2005

    • Inventor(s)
      山内尚雄, マーリット・カルピネン, 酒井佳, 長井拓郎, 浅香透, 松井良夫
    • Industrial Property Rights Holder
      財団法人理工学振興会
    • Industrial Property Number
      2005-036762
    • Filing Date
      2005-02-14
    • Related Report
      2004 Annual Research Report
  • [Patent(Industrial Property Rights)] (Bi,Pb)-2223高温超伝導体単結晶の製造方法2003

    • Inventor(s)
      本橋輝樹, 野村朋哉, M.Karppinen, 山内尚雄
    • Industrial Property Rights Holder
      財団法人理工学振興会
    • Filing Date
      2003-08-26
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Publications] M.Karppinen, K.Kotiranta, T.Nakane, S.C.Chang, J.M.Chen, R.S.Liu, H.Yamauchi: "Layer-specific hole concentrations in Bi_2Sr_2(Y_<1-x>Ca_x)Cu_2O_<8+δ> as probed by XANES spectroscopy and coulometric redox analysis"Physical Review B. 67. 134522-134527 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] M.Karppinen, V.P.S.Awana, Y.Morita, H.Yamauchi: "Oxygen stoichiometry in Co-1212, Co-1222 and Co-1232 of the homologous series Co-12s2 of "category-B" layered copper oxides"Physica C. 392-396. 82-86 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] M.Karppinen, H.Yamauchi, Y.Yasukawa, J.Linden, T.S.Chan, R.S.Liu, J.M.Chen: "Valence state of iron in the Sr_2Fe(Mo, W, Ta)O_<6.0> double-perovskite system : an Fe K-edge and L_<2,3>-edge XANES study"Chemistry of Materials. 15. 4118-4121 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] J.Linden, M.Karppinen, T.Shimada, Y.Yasukawa, H.Yamauchi: "Observation of antiphase boundaries in Sr_2FeMoO_6"Physical Review B. 68. 174415-174419 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] T.Shimada, J.Nakamura, T.Motohashi, H.Yamauchi, M.Karppinen: "Kinetics and thermodynamics of the degree of order of the B cations in double-perovskite Sr_2FeMoO_6"Chemistry of Materials. 15. 4494-4497 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] J.Linden, T.Shimada, T.Motohashi, H.Yamauchi, M.Karppinen: "Iron and molybdenum valences in double-perovskite (Sr, Nd)_2FeMoO_6 : electron-doping effect"Solid State Communications. 129. 129-133 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] M.Karppinen, H.Okamoto, H.Fjellvag, T.Motohashi, H.Yamauchi: "Oxygen and cation ordered perovskite, Ba_2Y_2Mn_4O_<11>"Journal of Solid State Chemistry. (in press). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] J.Linden, H.Yamauchi, M.Karppinen: "^<57>Fe Mossbauer spectroscopy investigation of the Fe^<II/III> mixed-valence state and the B-site order in double perovskite A_2FeMoO_6"Journal of Magnetism and Magnetic Materials. (in press). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] M.Karppinen, I.Asako, T.Motohashi, H.Yamauchi: "Oxidation state of cobalt in the Na_xCoO_<2-δ>・y H_2O superconductor"Chemistry of Materials. (in press). (2004)

    • Related Report
      2003 Annual Research Report

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Published: 2003-04-01   Modified: 2016-04-21  

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