テクスチャー構造の秩序変数をもつ新しい超伝導状態  [in Japanese] Texture in the Superconducting Order Parameter of CeCoIn_5 ; FFLO State as Evidenced by Ultrasound and NMR Studies  [in Japanese]

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Author(s)

Abstract

従来の超伝導はフェルミ面上で互いに逆方向の運動量と反平行のスピンをもった電子対(κ↑, -κ↓)が形成されることにより起こる.これに対し, Fulde-Ferrell-Larkin-Ovchinnikov (FFLO)は強磁場中で重心が有限の運動量qを持った電子対(κ+q↑, -κ↓)の凝縮による新しい超伝導状態が存在することを予言した.このFFLO状態では超伝導秩序変数が空間的に不均一なテクスチャー(織り目)構造をもち, 極めて興味深い振舞いが予想される.FFLO状態は超伝導だけでなく, 超流動液体ヘリウム, ボーズーアインシュタイン凝縮した希薄原子, カラー超伝導状態にある中性子星内部においてもその存在が予測されている新しい量子凝縮相である.しかしながら, FFLO状態はこれまでどの系においても見つかっていなかった.最近の実験で準2次元的な電子構造を持った重い電子系化合物CeCoIn_5においてFFLO相の存在が明らかになりつつある.ここでは, 最近の実験結果を中心に解説しFFLO状態に迫りたい.

A myriad of fascinating properties have been proposed for unconventional superconductors in the presence of a strong magnetic field. Among the possible exotic superconducting (SC) phases, a spatially nonuniform SC state originating from the paramagnetism of conduction electrons has become a subject of particular interest after the pioneering work by Fulde and Ferrell and as well Larkin and Ovchinnikov (FFLO) in the mid-1960's. We present here ultrasound and NMR studies of the quasi-2D heavy-fermion superconductor CeCoIn_5 with extremely large Pauli paramagnetic susceptibility, which is believed to host a FFLO state. We are able to establish clear evidences of the spatially-inhomogeneous SC state at high field and low temperatures, precisely as expected in a FFLO state.

Journal

  • Butsuri

    Butsuri 61(2), 77-83, 2006-02-05

    The Physical Society of Japan (JPS)

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  • Normal-state Hall Angle and Magnetoresistance in Quasi-2D Heavy Fermion CeCoIn_5 near a Quantum Critical Point

    NAKAJIMA Y. , IZAWA K. , MATSUDA Y. , UJI S. , TERASHIMA T. , SHISHIDO H. , SETTAI R. , ONUKI Y. , KONTANI H.

    Journal of the Physical Society of Japan 73(1), 5-8, 2004-01-15

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Codes

  • NII Article ID (NAID)
    110004101414
  • NII NACSIS-CAT ID (NCID)
    AN00196952
  • Text Lang
    JPN
  • Article Type
    REV
  • ISSN
    00290181
  • NDL Article ID
    7794216
  • NDL Source Classification
    ZM35(科学技術--物理学)
  • NDL Call No.
    Z15-13
  • Data Source
    CJP  NDL  NII-ELS 
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