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2004 Fiscal Year Final Research Report Summary

Superconducting gap structure of unconventional superconductors

Research Project

Project/Area Number 15340111
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Condensed matter physics II
Research InstitutionKyoto University (2004)
The University of Tokyo (2003)

Principal Investigator

MATSUDA Yuji  Kyoto University, Faculty of Science, Professor, 大学院・理学研究科, 教授 (50199816)

Co-Investigator(Kenkyū-buntansha) IZAWA Koichi  University of Tokyo, Institute for Solid State Physics, Research Associate, 物性研究所, 助手 (90302637)
Project Period (FY) 2003 – 2004
KeywordsSuperconducting gap / Unconventional superconductor / Inversion symmetry / Spin wave / Thermal conductivity / Heavy fermion / Hall effect / Nernst effect
Research Abstract

Superconductivity with unconventional pairing symmetry has been a central subject in the physics of superconductors. The vast majority of superconductors have conventional s-wave symmetry with an isotropic gap which is independent of directions over the entire Fermi surface. In the last two decades unconventional superconductivity with different symmetry has been found heavy fermion materials, high-Tc cuprates, and organic compounds. Since the nodal structure is ultimately related to the pairing interaction, its identification is crucial for understanding the pairing mechanism.
Recently, thermal conductivity measurements in magnetic field inrotating various directions relative to the crystal axis provide an important information of the superconducting gap structure, inclusing the nodal directions. In this project, we have determined the superconducting gap structure in PrOs4Sb14, UPd2Al3, and CePt3Si, PrOs4Os14 is a recently discovered heavy fermion superconductor with filled skutterdite structure. We found that there are two different superconducting phases with two and four fold symmetry in the superconducting phase, We also showed that UPd2Al3, in which antiferomagnetic order coexists with superconductivity, has horizontal line nodes parallel to the basal plane. In CePt3Si, with no spatial inversion symmetry, we found line nodes.
We also performed ultrasound and NMR measurements on the unconventional superconductor CeCoIn5, wherein we find a novel flux line lattice phase in the vicinity of the upper critical field at very low temperatures. We provide the first compelling evidence of a textured order parameter phase in superconductors, which was predicted some 4 decades ago but never reported experimentally up to now, in spite of extensive exploration in various superconductors.

  • Research Products

    (7 results)

All 2004

All Journal Article (7 results)

  • [Journal Article] Normal-state Hall Angle and Magnetoresistance in quasi-2D Heavy Fermion CeCoIn5 near a Quantum Critical Point2004

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

      Journal of Physical Society of Japan 773

      Pages: 5-8

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Giant Nernst Effect in CeCoIn52004

    • Author(s)
      R.Bel et al.
    • Journal Title

      Physical Review Letters 92

      Pages: 217002

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] High Field State of Flux Line Lattice in Unconventional Superconductor CeCoIn52004

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

      Physical Review B 70

      Pages: 020506

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Superconducting Gap Function in Antiferromagnetic Heavy-Fermion UPd2A13 Probed by Angle Resolved Magnetothermal Transport Measurements.2004

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

      Physical Review B 70

      Pages: 184502

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Flux-Line Lattice Distortion in PrOs4Sb122004

    • Author(s)
      A.D.Huxley et al.
    • Journal Title

      Physical Review Letters 93

      Pages: 187005

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Texture in the Superconducting Order Parameter of CeCoIn5 Revealed by Nuclear Magnetic Resonance2004

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

      Physical Review Letters 94

      Pages: 047602

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Normal-state Hall Angle and Magnetoresistance of Japan in quasi-2D Heavy Fermion CeCoIn5 near a Quantum Critical Point2004

    • Author(s)
      N.Nakajima et al.
    • Journal Title

      Journal of Physical Society 733

      Pages: 5-8

    • Description
      「研究成果報告書概要(欧文)」より

URL: 

Published: 2006-07-11  

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