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Dopant ordering and enhancement of superconducting transition temperature induced by co-doping of iron-based superconductors

Research Project

Project/Area Number 23740274
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Condensed matter physics II
Research InstitutionOkayama University

Principal Investigator

KUDO Kazutaka  岡山大学, 大学院・自然科学研究科, 助教 (40361175)

Project Period (FY) 2011 – 2012
Project Status Completed (Fiscal Year 2012)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2012: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2011: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Keywords高温超伝導 / 鉄系超伝導体 / 新物質開発
Research Abstract

Iron-based superconductors consist of alternating two-dimensional Fe2As2layers and spacer layers. In order to realize higher transition temperature Tc, it is essential to seek novel spacer layers to optimize the electronic state in Fe2As2layer. The spacer layers reported so far consist of ionic chemical bonds. In this study, we discovered iron-based superconductors Ca10(PtnAs8)(Fe2-xPtxAs2)5(n = 3, 4) with PtnAs8spacer layers made of covalent chemical bonds. Tc= 17 K was observed in the beta phase (n = 3), in which Pt and vacancy are ordered in the spacer layer. By adjusting the amounts of Pt and vacancy, Tcwas raised up to 38 K in the alpha phase (n = 4). Our results demonstrated that a variety of spacer layers can be included in the iron-based superconductors.

Report

(3 results)
  • 2012 Annual Research Report   Final Research Report ( PDF )
  • 2011 Research-status Report
  • Research Products

    (53 results)

All 2013 2012 2011 Other

All Journal Article (15 results) (of which Peer Reviewed: 15 results) Presentation (25 results) (of which Invited: 1 results) Remarks (13 results)

  • [Journal Article] Emergence of superconductivity at 45 K by lanthanum and phosphorus co-doping of CaFe2As22013

    • Author(s)
      K. Kudo, K. Iba, M. Takasuga, Y. Kitahama, J. Matsumura, M. Danura, Y. Nogami, and M. Nohara
    • Journal Title

      Scientific Reports

      Volume: 3 Issue: 1

    • DOI

      10.1038/srep01478

    • Related Report
      2012 Annual Research Report 2012 Final Research Report
    • Peer Reviewed
  • [Journal Article] Giant Phonon Softening and Enhancement of Superconductivity by Phosphorus Doping of BaNi2As22012

    • Author(s)
      K. Kudo, M. Takasuga, Y. Okamoto, Z. Hiroi, and M. Nohara
    • Journal Title

      Physical Review Letters

      Volume: 109 Issue: 9

    • DOI

      10.1103/physrevlett.109.097002

    • Related Report
      2012 Annual Research Report 2012 Final Research Report
    • Peer Reviewed
  • [Journal Article] Iron-platinum-arsenide superconductors Ca10(PtnAs8)(Fe2-xPtxAs2)52012

    • Author(s)
      Minoru Nohara, Satomi Kakiya, Kazutaka Kudoa, Yoshihiro Oshiro, Shingo Araki, Tatsuo C.Kobayashi, Kenta Oku, Eiji Nishibori, Hiroshi Sawa
    • Journal Title

      Solid State Communications

      Volume: 152 Issue: 8 Pages: 635-639

    • DOI

      10.1016/j.ssc.2011.12.034

    • NAID

      120004873431

    • Related Report
      2012 Annual Research Report 2012 Final Research Report
    • Peer Reviewed
  • [Journal Article] Breakdown of chemical scaling for Pt-doped CaFe2As22012

    • Author(s)
      K. Kudo, M. Kobayashi, S. Kakiya, M. Danura, and M. Nohara
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 81 Issue: 3 Pages: 035002-035002

    • DOI

      10.1143/jpsj.81.035002

    • NAID

      210000109461

    • Related Report
      2012 Final Research Report 2011 Research-status Report
    • Peer Reviewed
  • [Journal Article] Superconductivity Induced by Bond Breaking in the Triangular Lattice of IrTe22012

    • Author(s)
      S. Pyon
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 81 Issue: 5 Pages: 053701-053701

    • DOI

      10.1143/jpsj.81.053701

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Enhanced thermoelectric properties by Ir doping of PtSb2 with pyrite structure2012

    • Author(s)
      Y. Nishikubo
    • Journal Title

      Applied Physics Letters

      Volume: 100 Issue: 25

    • DOI

      10.1063/1.4729789

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Orbital Degeneracy, Jahn-Teller Effect, and Superconductivity in Transition-Metal Chalcogenides2012

    • Author(s)
      Mizokawa, T et al.
    • Journal Title

      JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM

      Volume: 25 Issue: 5 Pages: 1343-1346

    • DOI

      10.1007/s10948-012-1626-x

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Orbital degeneracy and Peierls instability in the triangular-lattice superconductor Ir1-xPtxTe22012

    • Author(s)
      Ootsuki, D Wakisaka, Y Pyon, S Kudo, K Nohara, M Arita, M Anzai, H Namatame, H Taniguchi, M Saini, NL Mizokawa, T
    • Journal Title

      PHYSICAL REVIEW B

      Volume: 86 Issue: 1 Pages: 1-5

    • DOI

      10.1103/physrevb.86.014519

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Anisotropic Behavior of Thermal Conductivity in theBose-Einstein Condensed State of the Bond-Alternating Spin-Chain System Pb_2V_3O_92012

    • Author(s)
      M. Sato, T. Kawamata, K. Naruse, K. Kudo, N. Kobayashi, Y. Koike
    • Journal Title

      Journal of Physics: Conference Series

      Volume: 400 Issue: 3 Pages: 032079-032079

    • DOI

      10.1088/1742-6596/400/3/032079

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Inhomogeneity of superconductivity and stripe correlations at x ~ 0.21 in La2-xSrxCuO42012

    • Author(s)
      M. Miyazaki
    • Journal Title

      Journal of Physics: Conference Series

      Volume: 400 Issue: 2 Pages: 022074-022074

    • DOI

      10.1088/1742-6596/400/2/022074

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Superconductivity in pseudo-binary silicide SrNixSi2-x with AlB2-type structure2012

    • Author(s)
      S. Pyon, K. Kudo, M. Nohara
    • Journal Title

      Journal of Physical Society of Japan

      Volume: 81 Issue: 2 Pages: 023702-023702

    • DOI

      10.1143/jpsj.81.023702

    • NAID

      210000109365

    • Related Report
      2011 Research-status Report
    • Peer Reviewed
  • [Journal Article] Interplay of superconductivity and Fermi-liquid transport in Rh-doped CaFe2As2with lattice- collapse transition2011

    • Author(s)
      M. Danura, K. Kudo, Y. Oshiro, S. Araki, T. C. Kobayashi, and M. Nohara
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 80 Issue: 10 Pages: 103701-103701

    • DOI

      10.1143/jpsj.80.103701

    • NAID

      40019034048

    • Related Report
      2012 Final Research Report 2011 Research-status Report
    • Peer Reviewed
  • [Journal Article] Superconductivity at 38 K in the iron-based compound with platinum-arsenide layers Ca10(Pt4As8)(Fe2-xPtxAs2)52011

    • Author(s)
      S.Kakiya, K.Kudo, Y.Nishikubo, K.Oku, E.Nishibori, H.Sawa, T.Yamamoto, T.Nozaka, M.Nohara
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 80 Issue: 9 Pages: 093704-093704

    • DOI

      10.1143/jpsj.80.093704

    • NAID

      210000109176

    • Related Report
      2012 Final Research Report 2011 Research-status Report
    • Peer Reviewed
  • [Journal Article] Superconductivity in the honeycomb-lattice pnictide SrPtAs2011

    • Author(s)
      Y. Nishikubo, K. Kudo, and M. Nohara
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 80 Issue: 5 Pages: 055002-055002

    • DOI

      10.1143/jpsj.80.055002

    • NAID

      210000109028

    • Related Report
      2012 Final Research Report 2011 Research-status Report
    • Peer Reviewed
  • [Journal Article] Two Pseudogaps with Different Energy Scales at the Antinode of the High-Temperature Bi2Sr2CuO6Superconductor Using Angle-Resolved Photoemission Spectroscopy2011

    • Author(s)
      K. Nakayama, T. Sato, Y.-M. Xu, Z.-H.Pan, P. Richard, H. Ding, H.-H. Wen, K. Kudo, T. Sasaki, N. Kobayashi, and T. Takahashi
    • Journal Title

      Phys. Rev. B

      Volume: vol. 83 Issue: 22

    • DOI

      10.1103/physrevb.83.224509

    • Related Report
      2011 Research-status Report
    • Peer Reviewed
  • [Presentation] Chemical tuning of soft-phonons and enhancement of superconductivity in BaNi2As22013

    • Author(s)
      K. Kudo
    • Organizer
      QS2C Theory Forum International Symposium on "Strongly Correlated Quantum Science"
    • Place of Presentation
      Tokyo, Japan
    • Related Report
      2012 Final Research Report
  • [Presentation] Chemical tuning of soft-phonons and enhancement of superconductivity in BaNi2As22013

    • Author(s)
      K. Kudo
    • Organizer
      QS2C Theory Forum International Symposium on “Strongly Correlated Quantum Science”
    • Place of Presentation
      University of Tokyo, Tokyo, Japan
    • Related Report
      2012 Annual Research Report
  • [Presentation] PtSb2とPtAs2の熱電特性2013

    • Author(s)
      工藤一貴
    • Organizer
      日本物理学会第68回年次大会
    • Place of Presentation
      広島大学(東広島)
    • Related Report
      2012 Annual Research Report
  • [Presentation] Electronic phase diagram of the iron-based superconductors Ca10(PtnAs8)(Fe2-xPtxAs2)5(n = 3, 4) with novel platinum-arsenide layers2012

    • Author(s)
      K. Kudo
    • Organizer
      International Symposium on Physics and Chemistry of Novel Superconductors and Related Materials
    • Place of Presentation
      Okayama, Japan
    • Related Report
      2012 Final Research Report
  • [Presentation] Superconductivity in the platinum-based arsenide SrPt2As2with a CaBe2Ge2-type structure2012

    • Author(s)
      K. Kudo
    • Organizer
      M2S 2012 Materials & Mechanisms of Superconductivity Conference
    • Place of Presentation
      Washington, D.C., USA
    • Related Report
      2012 Final Research Report
  • [Presentation] Electronic phase diagram of the iron-platinum-based superconductors Ca10(Pt4As8)(Fe2-xPtxAs2)5and Ca10(Pt3As8)(Fe2-xPtxAs2)52012

    • Author(s)
      K. Kudo
    • Organizer
      M2S 2012 Materials & Mechanisms of Superconductivity Conference
    • Place of Presentation
      Washington, D.C., USA
    • Related Report
      2012 Final Research Report
  • [Presentation] Interplay of Magnetic Fluctuation and Superconductivity in Ca(Fe1-xTMx)2As2(TM = Ru, Rh) with Lattice Collapse Transition2012

    • Author(s)
      K. Kudo
    • Organizer
      2012 MRS Spring Meeting
    • Place of Presentation
      San Francisco, USA
    • Related Report
      2012 Final Research Report
  • [Presentation] Superconductivity at 38 K in Ca10(Pt4As8)(Fe2-xPtxAs2)5with Novel Platinum-Arsenide Layers2012

    • Author(s)
      K. Kudo
    • Organizer
      2012 MRS Spring Meeting
    • Place of Presentation
      San Francisco, USA
    • Related Report
      2012 Final Research Report
  • [Presentation] 鉄白金系超伝導体Ca10(Pt4As8)(Fe2-xPtxAs2)5における超伝導転移温度のPt量依存性2012

    • Author(s)
      垣谷知美
    • Organizer
      日本物理学会第67回年次大会
    • Place of Presentation
      関西大学
    • Related Report
      2012 Final Research Report 2011 Research-status Report
  • [Presentation] Discovery of Iron-Platinum based Arsenide Superconductor with Transition Temperature 38 K2012

    • Author(s)
      K. Kudo
    • Organizer
      UK-Japan Meeting 2012 in Tokyo
    • Place of Presentation
      Tokyo, Japan
    • Related Report
      2012 Final Research Report
  • [Presentation] Superconductivity at 38 K in Ca10(Pt4As8)(Fe2-xPtxAs2)5 with Novel Platinum-Arsenide Layers2012

    • Author(s)
      K. Kudo
    • Organizer
      2012 MRS Spring Meeting
    • Place of Presentation
      San Francisco, USA
    • Related Report
      2012 Annual Research Report
  • [Presentation] Interplay of Magnetic Fluctuation and Superconductivity in Ca(Fe1-xTMx)2As2 (TM = Ru, Rh) with Lattice Collapse Transition2012

    • Author(s)
      K. Kudo
    • Organizer
      2012 MRS Spring Meeting
    • Place of Presentation
      San Francisco, USA
    • Related Report
      2012 Annual Research Report
  • [Presentation] Electronic phase diagram of the iron-platinum-based superconductors Ca10(Pt4As8)(Fe2-xPtxAs2)5 and Ca10(Pt3As8)(Fe2-xPtxAs2)52012

    • Author(s)
      K. Kudo
    • Organizer
      M2S 2012, Materials & Mechanisms of Superconductivity Conference
    • Place of Presentation
      Washington, D.C., USA
    • Related Report
      2012 Annual Research Report
  • [Presentation] Superconductivity in the platinum-based arsenide SrPt2As2 with a CaBe2Ge2-type structure2012

    • Author(s)
      K. Kudo
    • Organizer
      M2S 2012, Materials & Mechanisms of Superconductivity Conference
    • Place of Presentation
      Washington, D.C., USA
    • Related Report
      2012 Annual Research Report
  • [Presentation] PドープBaNi2As2におけるフォノンのソフト化と超伝導転移温度の増大2012

    • Author(s)
      工藤一貴
    • Organizer
      日本物理学会2012年秋季大会
    • Place of Presentation
      横浜国立大学(横浜)
    • Related Report
      2012 Annual Research Report
  • [Presentation] Electronic phase diagram of the iron-based superconductors Ca10(PtnAs8)(Fe2-xPtxAs2)5 (n = 3, 4) with novel platinum-arsenide layers2012

    • Author(s)
      K. Kudo
    • Organizer
      International Symposium on Physics and Chemistry of Novel Superconductors and Related Materials
    • Place of Presentation
      Okayama University, Okayama, Japan
    • Related Report
      2012 Annual Research Report
  • [Presentation] BaNi2As2における巨大な格子のソフト化と超伝導転移温度の増大2012

    • Author(s)
      工藤一貴
    • Organizer
      ISSPワークショップ「強相関物質開発の最前線」
    • Place of Presentation
      東京大学物性研究所(柏)
    • Related Report
      2012 Annual Research Report
    • Invited
  • [Presentation] Discovery of Iron-based Arsenide Superconductor with Transition Temperature 38 K2012

    • Author(s)
      K. Kudo, S. Kakiya, Y. Nishikubo, K. Oku, E. Nishibori, H. Sawa, T. Yamamoto, T. Nozaka, M. Nohara
    • Organizer
      UK-Japan Meeting 2012 in Tokyo
    • Place of Presentation
      Tokyo, Japan
    • Related Report
      2011 Research-status Report
  • [Presentation] IrドープCaFe2As2の電子相図2012

    • Author(s)
      工藤一貴,光岡大輔,高須賀政哉,松村純一,小林正和,檀浦匡隆,野原実
    • Organizer
      日本物理学会第67回年次大会
    • Place of Presentation
      関西大学
    • Related Report
      2011 Research-status Report
  • [Presentation] 転移温度38Kを示す鉄白金系高温超伝導体の発見2011

    • Author(s)
      工藤一貴
    • Organizer
      「対称性の破れた凝縮系におけるトポロジカル量子現象」第2回 領域研究会
    • Place of Presentation
      岡山大学
    • Related Report
      2012 Final Research Report
  • [Presentation] Interplay of superconductivity and magnetic fluctuation in doped CaFe2As2with lattice collapse transition2011

    • Author(s)
      K. Kudo
    • Organizer
      International Conference on Novel Superconductivity in Taiwan
    • Place of Presentation
      Tainan, Taiwan
    • Related Report
      2012 Final Research Report
  • [Presentation] Interplay of superconductivity and magnetic fluctuation in doped CaFe2As2 with lattice collapse transition2011

    • Author(s)
      K. Kudo, M. Danura, Y. Oshiro, S. Araki, T. C. Kobayashi, M. Nohara
    • Organizer
      International Conference on Novel Superconductivity in Taiwan
    • Place of Presentation
      Tainan, Taiwan
    • Related Report
      2011 Research-status Report
  • [Presentation] SrPt2As2におけるCDW転移と超伝導2011

    • Author(s)
      工藤一貴,西窪義博,野原実
    • Organizer
      日本物理学会 2011 年秋季大会
    • Place of Presentation
      富山大学
    • Related Report
      2011 Research-status Report
  • [Presentation] 構造相転移の抑制によって発現するBaNi2As2の超伝導2011

    • Author(s)
      工藤一貴,高須賀政哉,檀浦匡隆,小林正和,卞舜生,岡本佳比古,広井善二,野原実
    • Organizer
      「対称性の破れた凝縮系におけるトポロジカル量子現象」第2回領域研究会
    • Place of Presentation
      岡山大学
    • Related Report
      2011 Research-status Report
  • [Presentation] 転移温度38Kを示す鉄白金系高温超伝導体の発見2011

    • Author(s)
      工藤一貴,垣谷知美,西窪義博,奥健太,西堀英治,澤博,山本剛久,野坂俊夫,野原実
    • Organizer
      「対称性の破れた凝縮系におけるトポロジカル量子現象」第2回領域研究会
    • Place of Presentation
      岡山大学
    • Related Report
      2011 Research-status Report
  • [Remarks] 2013年3月29日, 日刊工業新聞, 岡山大、鉄系物質で超電導転移温度を絶対温度45度に、5年ぶり最高値更新

    • Related Report
      2012 Final Research Report
  • [Remarks] 2013年3月27日, 日経産業新聞, 安価な鉄で超電導物質 岡山大、加工容易な結晶

    • Related Report
      2012 Final Research Report
  • [Remarks] 2012年11月9日, 山陽新聞, 電気抵抗ゼロ 高い移行温度 化合物軟化に成功

    • Related Report
      2012 Final Research Report
  • [Remarks] 2012年10月1日, 日刊工業新聞, 岡山大など、ニッケル化合物がリン混合で転移温度5倍以上に上昇することを発見

    • Related Report
      2012 Final Research Report
  • [Remarks] 2012年9月27日, 日経産業新聞, 臨界温度高める新手法 岡山大など 超電導材料、軟らかく

    • Related Report
      2012 Final Research Report
  • [Remarks] 2011年10月7日, 科学新聞, 世界一複雑な原子配列を持つ高温超伝導体 岡山大、名大、東大の研究グループ発見

    • Related Report
      2012 Final Research Report
  • [Remarks] 2011年9月26日, 日経産業新聞, 超電導物質 新しい鉄系発見 岡山大

    • Related Report
      2012 Final Research Report
  • [Remarks]

    • URL

      http://www.okayama-u.ac.jp/up_load_files/soumu-pdf/press23/press-110915-4.pdf

    • Related Report
      2012 Final Research Report
  • [Remarks]

    • URL

      http://www.okayama-u.ac.jp/up_load_files/soumu-pdf/press24/press-0920-7.pdf

    • Related Report
      2012 Final Research Report
  • [Remarks]

    • URL

      http://www.okayama-u.ac.jp/up_load_files/soumu-pdf/press24/press-0322-3.pdf

    • Related Report
      2012 Final Research Report
  • [Remarks] 鉄系超伝導基本物質の臨界温度で世界記録更新

    • URL

      http://www.okayama-u.ac.jp/up_load_files/soumu-pdf/press24/press-0322-3.pdf

    • Related Report
      2012 Annual Research Report
  • [Remarks] 高温超電導実現条件を実証

    • URL

      http://www.okayama-u.ac.jp/up_load_files/soumu-pdf/press24/press-0920-7.pdf

    • Related Report
      2012 Annual Research Report
  • [Remarks]

    • URL

      http://www.okayama-u.ac.jp/up_load_files/soumu-pdf/press23/press-110915-4.pdf

    • Related Report
      2011 Research-status Report

URL: 

Published: 2011-08-05   Modified: 2020-05-15  

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