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パナスコピック形態制御された希土類系物質の高圧力誘起電磁物性

Research Project

Project/Area Number 16080212
Research Category

Grant-in-Aid for Scientific Research on Priority Areas

Allocation TypeSingle-year Grants
Review Section Science and Engineering
Research InstitutionKyushu University

Principal Investigator

巨海 玄道  Kyushu University, 大学院・理学研究院, 教授 (00111146)

Co-Investigator(Kenkyū-buntansha) 石田 清隆  九州大学, 比較社会研究院, 准教授 (60108602)
大橋 政司  金沢大学, 自然科学, 准教授 (10336000)
桜井 浩 (櫻井 浩)  群馬大学, 工学部, 准教授 (80251122)
Project Period (FY) 2004 – 2008
Project Status Completed (Fiscal Year 2007)
Budget Amount *help
¥32,300,000 (Direct Cost: ¥32,300,000)
Fiscal Year 2007: ¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 2006: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 2005: ¥13,000,000 (Direct Cost: ¥13,000,000)
Fiscal Year 2004: ¥15,000,000 (Direct Cost: ¥15,000,000)
Keywords高圧 / 重い電子系 / 反強磁性 / 高圧合成 / 巨大磁気抵抗 / 希土類 / 層状化合物 / 圧力 / 層状構造 / 強相関電子系 / 量子相転移 / 人工格子
Research Abstract

19年度は主に以下のようなテーマに絞り研究を行った。
1)高濃度近藤化合物CeAu2Si2の高圧下における電子物性
この物質は層状構造を持ち、約8Kで反強磁性秩序を示す。ネール温度TNは高圧下で消失すると考えられ、より高圧側での電子状態に興味が持たれている。高圧下の近藤効果の実験はスイスのJaccard達により調べられているが、TNやメタ磁性転移磁場B_Mの圧力効果などについての詳細な研究はまだなされていない。更に単結晶を使った精密な電気抵抗測定はその例がない。このようなことから本研究においては3.4GPaまでの圧力範囲で電気抵抗や磁気抵抗を調べた。常圧では反強磁性特有のハンプを示して抵抗は上がり、ピークを作って再び下がりはじめる。この抵抗のハンプは圧力を上げるとはっきりしなくなるが明らかに高温側にシフトしている。このハンプの始まりの温度をネール温度TNと定義し、ピークの温度をTmasと定義する。T_NとTmaxはいずれも加圧により増加し、圧力に対してほぼ同じような振る舞いをする。しかし細かく見るとT_Nは圧力に対して1GPa近傍で異常を示す。この詳細な理由は今のところよく分かっていないが磁気構造の異常によるものと思われる。常圧下における磁気抵抗効果は磁場がそれぞれa軸、c軸に平行な場合に対して大きな異方性を示した。c軸に平行な場合は約4T(=B_M)でメタ磁性転移による不連続な飛びを示す。圧力効果については低圧でははっきりと見えていた転移が高圧下ではかなり不鮮明になり、更にB_Mは加圧とともに増加する事が明らかとなった。この増加はT_Nの加圧による増加と熱力学的によく対応している。
2)反強磁性化合物CeIn3の高圧合成
Ceの特異な圧力-温度相図を使って磁気秩序を示す重い電子系化合物CeIn3の高圧合成を行った。これまでは高圧合成により磁気秩序を示さない化合物の合成に成功しており、またこの化合物の成長が冷却速過程によることを明らかにした。今回更に作製条件を明らかにするため冷却速度の最適化を図った。その結果作製直後は反強磁性を示さない試料が約一週間後に測定してみると磁気秩序を示すことが分かった。即ちこれらの試料は結晶学的に不安定状態で出来ており、経時変化を示すことが明らかとなった。今後より詳細な作製条件を突き止めていく。

Report

(4 results)
  • 2007 Annual Research Report
  • 2006 Annual Research Report
  • 2005 Annual Research Report
  • 2004 Annual Research Report
  • Research Products

    (37 results)

All 2008 2007 2006 2005 2004

All Journal Article (27 results) (of which Peer Reviewed: 9 results) Presentation (9 results) Book (1 results)

  • [Journal Article] Effects of Pressure on the Magnetic and Structural Properties of GdCu2007

    • Author(s)
      J. R., Fernandez, et. al.
    • Journal Title

      J. Phys. Soc. Jpn. Suppl. A 76

      Pages: 51-53

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Effect of Pressure on Electrical Resistivity and Magnetoresistance of β-Ce2007

    • Author(s)
      Y., Sakigawa, et. al.
    • Journal Title

      J. Phys. Soc. Jpn. Suppl. A 76

      Pages: 66-67

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Synthesis of Heavy Fermion Ce Compound under High Pressure2007

    • Author(s)
      H., Miyagawa, et. al.
    • Journal Title

      J. Phys. Soc. Jpn. Suppl. A 76

      Pages: 72-73

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Thermal Expansion Characteristics Associated with Spin Fluctuations under Applied Magnetic Field and High Pressure forLu(Co_<0.9>Ga_<0.1>)_2 Laves-Phase Compoud2007

    • Author(s)
      M., Ohta, et. al.
    • Journal Title

      J. Phys. Soc. Jpn. Suppl. A 76

      Pages: 84-85

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Low-Energy Magnetic Excitations in CeAl_2 under Pressure Investigated by ^<27>Al-Nuclear Magnetic Resonance Measurement2007

    • Author(s)
      S., Tomisawa, et. al.
    • Journal Title

      J. Phys. Soc. Jpn. Suppl. A 76

      Pages: 164-165

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] New Apparatus for Precisc Electrical Transport Measurements under Quasi-Hydrostatic Pressures up to 15 Gpa2007

    • Author(s)
      M., Ohashi, et. al.
    • Journal Title

      J. Phys. Soc. Jpn. Suppl. A 76

      Pages: 226-227

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Pressure effect on elastic properties in SmRu_4P_<12>2007

    • Author(s)
      P., Sun, et. al.
    • Journal Title

      J. Magn. Magn. Mater. 310

      Pages: 169-171

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] AC magnetic susceptibility studies of single crystalline CeNiGe_2 under high pressure2007

    • Author(s)
      M., Ohashi, et. al.
    • Journal Title

      J. Phys. Soc. Jpn. 76

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] High pressure study of novel electronic properties in Sr_2Fe(W_<1-x>Mox)O_<-6> near metal-insulator transition2007

    • Author(s)
      G., Oomi, et. al.
    • Journal Title

      International Journal of Modern Physics B 21

      Pages: 3279-3284

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Magnetoresistance of CePtSi_2 under high pressure2006

    • Author(s)
      H Miyagawa, Y Fuchizaki, M Ohashi, G. Oomi, I. Satoh, T. Komatsubara
    • Journal Title

      High Pressure Research 26

      Pages: 503-507

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Effect of pressure on the giant magnetoresistance of Fe/Tb multilayer2006

    • Author(s)
      Masashi Ohashi, Gendo Oomi, Hiroshi Sakurai
    • Journal Title

      Journal of physics : Conference Series 51

      Pages: 119-122

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Pressure induced topological phase transition in the heavy fermion compound CeAl_22006

    • Author(s)
      H.Miyagawa, M.Ohashi, G.Oomi, I.Satoh, T.Komatsubara, N.Miyajima, Y.Yagi
    • Journal Title

      Topology in Ordered Phases

      Pages: 203-207

    • Related Report
      2006 Annual Research Report
  • [Journal Article] The effect of pressure on the low energy spin fluctuations in CeAl_2 investigated through ^<27>Al nuclear quadrupole resonance and nuclear magnetic resonance measurements2006

    • Author(s)
      S.Tomisawa, S.Wada, M.Ohashi, G.Oomi
    • Journal Title

      J. Phys. : Condens. Matter 18

      Pages: 10413-10426

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Single crystal growth of RNiX_2 (R=U and Ce, X=Si and Ge) ternary compounds2006

    • Author(s)
      M.Ohashi, G.Oomi, K.Ishida, I.Satoh
    • Journal Title

      J. Phys. Soc. Jpn. Suppl. 75

      Pages: 124-126

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Anomalous thermal expansion and magnetostriction of rare earth compounds under high pressure2006

    • Author(s)
      G.Oomi, T.Kagayama
    • Journal Title

      Journal of Alloys and Compounds 408-412

      Pages: 301-306

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Effect of pressure on the spontaneous volume magnetostriction of GdAl_22006

    • Author(s)
      Y.Fuchizaki et al.
    • Journal Title

      Journal of Alloys and Compounds 408-412

      Pages: 234-237

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Pressure-enhanced magnetoresistance of α-Ce single crystal2006

    • Author(s)
      H.Miyagawa et al.
    • Journal Title

      Journal of Alloys and Compounds 408-412

      Pages: 230-233

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Effect of pressure on the superconductiviting properties and magnetism in HoNi_2B_2C2006

    • Author(s)
      H.Akiyama et al.
    • Journal Title

      Journal of Alloys and Compounds 408-412

      Pages: 226-229

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Effect of pressure on the lattice properties in Eu_<0.58>Sr_<0.42>MnO_3 perovskite2006

    • Author(s)
      S.Kaji et al.
    • Journal Title

      Journal of Alloys and Compounds 408-412

      Pages: 219-222

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Single-crystal growth of layered structure Ce-Ni-Ge ternary compounds2006

    • Author(s)
      M.Ohashi et al.
    • Journal Title

      Journal of Alloys and Compounds 408-412

      Pages: 84-87

    • NAID

      10013067422

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Valence instability of cerium under pressure in the Kondo-like perovskite La_<0.1>Ce_<0.4>Sr_<0.5>MnO_32005

    • Author(s)
      T.Eto et al.
    • Journal Title

      Physical Review B 72

      Pages: 60402-60402

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Quantum-phase transition in HoNi_2B_2C tuned by a magnetic field2004

    • Author(s)
      M.Ohashi et al.
    • Journal Title

      J.Magn.Magn.Mater 272-276

      Pages: 263-263

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Temperature dependence of electrical resistivity of Co/Cu multilayers at static magnetic field2004

    • Author(s)
      K.Suenaga et al.
    • Journal Title

      J.Magn.Magn.Mater 272-276

      Pages: 1231-1231

    • Related Report
      2004 Annual Research Report
  • [Journal Article] The spontaneous volume magnetostriction of Cr metal under high pressure2004

    • Author(s)
      G.Oomi et al.
    • Journal Title

      J.Magn.Magn.Mater 272-276

      Pages: 2074-2074

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Thermal variation of the magneto-transport properties of Co/Cu magnetic multilayers2004

    • Author(s)
      T.Sakai et al.
    • Journal Title

      J.Magn.Magn.Mater 272-276

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Effect of pressure on intermediate valence states in Cerium Kondo Compounds2004

    • Author(s)
      G.Oomi et al.
    • Journal Title

      J.of.RARE EARTES 22

      Pages: 7-7

    • Related Report
      2004 Annual Research Report
  • [Journal Article] High pressure studies of anomalous electronic states of Y_<1-x>U_xPd_32004

    • Author(s)
      G.Oomi et al.
    • Journal Title

      J.Phys.: Condens.Matter 16

      Pages: 3385-3385

    • Related Report
      2004 Annual Research Report
  • [Presentation] 極低温強磁場実験用圧力セルの開発II2008

    • Author(s)
      八板克仁 等
    • Organizer
      日本物理学会 第63回年次大会
    • Place of Presentation
      近畿大学(東大阪)
    • Year and Date
      2008-03-24
    • Related Report
      2007 Annual Research Report
  • [Presentation] Fe/Tb人工格子薄膜の巨大磁気抵抗と圧力効果2008

    • Author(s)
      大橋政司 等
    • Organizer
      日本物理学会 第63回年吹大会
    • Place of Presentation
      近畿大学(東大阪)
    • Year and Date
      2008-03-23
    • Related Report
      2007 Annual Research Report
  • [Presentation] Ho_<1-x>Y_xNi_2B_2Cにおける超伝導転移点の異常な圧力効果2008

    • Author(s)
      巨海玄道 等
    • Organizer
      日本物理学会 第63回年吹大会
    • Place of Presentation
      近畿大学(東大阪)
    • Year and Date
      2008-03-23
    • Related Report
      2007 Annual Research Report
  • [Presentation] 極低温強磁場実験用圧力セルの開発2007

    • Author(s)
      八板克仁 等
    • Organizer
      第113回日本物理学会九州支部例会
    • Place of Presentation
      大分大学(大分)
    • Year and Date
      2007-12-01
    • Related Report
      2007 Annual Research Report
  • [Presentation] 近藤化合物 CeAu_2Si_2 の反強磁性に及ぼす圧力・磁場効果2007

    • Author(s)
      大村美央 等
    • Organizer
      第113回日本物理学会九州支部例会
    • Place of Presentation
      大分大学(大分)
    • Year and Date
      2007-12-01
    • Related Report
      2007 Annual Research Report
  • [Presentation] Ce化合物の高圧合成2007

    • Author(s)
      酒井久美子 等
    • Organizer
      第48回高圧討論会
    • Place of Presentation
      倉吉パークスクエア(倉吉)
    • Year and Date
      2007-11-22
    • Related Report
      2007 Annual Research Report
  • [Presentation] 高圧下におけるCeAu_2Si_2の磁性と伝導2007

    • Author(s)
      大村美央 等
    • Organizer
      日本物理学会 第62回年次大会
    • Place of Presentation
      北海道大学(札幌)
    • Year and Date
      2007-09-22
    • Related Report
      2007 Annual Research Report
  • [Presentation] 高圧下におけるα-Ceの電気抵抗及び磁気抵抗2007

    • Author(s)
      酒井久美子 等
    • Organizer
      日本物理学会 第62回年次大会
    • Place of Presentation
      北海道大学(札幌)
    • Year and Date
      2007-09-22
    • Related Report
      2007 Annual Research Report
  • [Presentation] 極低温強磁場実験用圧力セルの開発2007

    • Author(s)
      八板克仁 等
    • Organizer
      日本物理学会 第62回年次大会
    • Place of Presentation
      北海道大学(札幌)
    • Year and Date
      2007-09-22
    • Related Report
      2007 Annual Research Report
  • [Book] Novel Pressure induced Phenomena in Condensed Matter Systems2007

    • Author(s)
      T., Kagayama, et. al.
    • Total Pages
      240
    • Publisher
      The Physical Society Japan
    • Related Report
      2007 Annual Research Report

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Published: 2004-04-01   Modified: 2018-03-28  

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