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Study of the FFLO state with Anomalous Vortices in CeCoIn5

Research Project

Project/Area Number 20340082
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Condensed matter physics II
Research InstitutionHokkaido University

Principal Investigator

KUMAGAI Ken-ichi  北海道大学, 名誉教授 (70029560)

Project Period (FY) 2007 – 2011
Project Status Completed (Fiscal Year 2011)
Budget Amount *help
¥15,730,000 (Direct Cost: ¥12,100,000、Indirect Cost: ¥3,630,000)
Fiscal Year 2010: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2009: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2008: ¥7,280,000 (Direct Cost: ¥5,600,000、Indirect Cost: ¥1,680,000)
Keywords強相関係 / 強相関電子系 / 超伝導 / 核磁気共鳴 / 磁気秩序 / FFLO相 / FFLO / CeCoIn_5
Research Abstract

The quasi-two dimensional heavy fermion superconductor CeCoIn_5 continues to excite great interest, because it shows a number of fascinating superconducting properties. CeCoIn_5 is an extremely clean high-κ superconductor with d-wave symmetry. The superconductivity of CeCoIn_5 at high fields is destroyed by Pauli paramagnetic effect, as evidenced by the first-order phase transition at the upper critical field H_c2. Closely related to the Pauli limited superconductivity, this high-field and low-temperature phase (HL-phase) has been attributed to the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state. The presence of the FFLO state in CeCoIn5 has been supported by several experiments. However, recent NMR and neutron data in parallel field demonstrated a long-range static magnetic order in the HL-phase. Remarkably this incommensurate spin-density wave order vanishes when the superconductivity dies at H_c2, indicating that the magnetism and the exotic superconductivity are closely intertwined.
In this study, to improve our understanding of how the exotic superconductivity and magnetism can interact in CeCoIn_5, we measured NMR spectra on the three distinct In sites. ^<115>In NMR measurements demonstrate the emergence of a spatially distributed normal quasiparticle region in the HL-phase in parallel field. The field evolution of the paramagnetic magnetization and low energy quasiparticle DOS can be described well by the order parameter associated with the nodal plane formation via the FFLO second order phase transition. The NMR spectra also reveal that the spatially uniform SDW coexists with the FFLO nodal planes. The exotic HL-phase is suppressed with increasing the angle of the direction of magnetic field with respect to the a-axis, and disappears beyond θ~20°.
Our results provide strong evidence for the formation of the FFLO state via the second order phase transition, which coexists with the static magnetic order.

Report

(4 results)
  • 2011 Final Research Report ( PDF )
  • 2010 Annual Research Report
  • 2009 Annual Research Report
  • 2008 Annual Research Report
  • Research Products

    (27 results)

All 2012 2011 2010 2009 2008

All Journal Article (8 results) (of which Peer Reviewed: 5 results) Presentation (19 results)

  • [Journal Article] Evolution of Paramagnetic Quasiparticle Excitations Emerged in the High-Field Superconducting Phase of CeCoIn_52011

    • Author(s)
      K. Kumagai, H. Shishido, T. Shibauchim Y.Matsuda
    • Journal Title

      Phys. Rev. Lett.

      Volume: 106 Pages: 137004-137004

    • Related Report
      2011 Final Research Report
  • [Journal Article] NMR Study of Magnetically-Ordered State in a Novel Superconducting Phase in CeCoIn_52010

    • Author(s)
      K. Kumagai, N. Kondoh, H. Shishido, Y.Matsuda
    • Journal Title

      Physica C

      Volume: 470 Pages: 533-535

    • Related Report
      2011 Final Research Report
  • [Journal Article] NMR Study of Magnetically-Ordered State in a Novel Superconducting Phase in CeCoIn52010

    • Author(s)
      K.Kumagai, N.Kondoh, H.Shishido, Y.Matsuda
    • Journal Title

      Physica C

      Volume: 470

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Unconventional superconducting phase in the weakly correlated noncentrosymmetric Mo3Al2C compound2010

    • Author(s)
      E.Bauer, G.Rogl, X.Chen, H.Michor, G.Hilscher, E.Royanian, K.Kumagai
    • Journal Title

      Phys.Rev.B

      Volume: B82 Pages: 64511-64511

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] NMR Study of Magnetically-Ordered State in a Novel Superconducting Phase in CeCoIn_52010

    • Author(s)
      K.Kumagai
    • Journal Title

      Physica C (In press)

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Journal Article] NMR study of a FFLO state of CeCoIn_5 in a Perpendicular and a Parallel Field2008

    • Author(s)
      K. Kumagai, T. Oyaizu, Y. Furukawa, H.Shishido and Y. Matsuda
    • Journal Title

      Physica B

      Volume: 403 Pages: 1144-1146

    • Related Report
      2011 Final Research Report
  • [Journal Article] NMR study of a FFLO state of CeCoIn_5 in a perpendicular and a parallel field2008

    • Author(s)
      K. Kumagai,
    • Journal Title

      Physica B 403

      Pages: 1144-1146

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Local Spin Moment Distribution in Molecular Nanomagnets V15 and Cr_7Cd Determined by NMR2008

    • Author(s)
      K. Kumagai
    • Journal Title

      International Conference Series of A1P, CP 1003

      Pages: 3-7

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Presentation] NMR Study of Magnetic Order and Spatially-Modulated Superconducting Gap in CeCoIn_52012

    • Author(s)
      K. Kumagai, H. Shishido, T. Shibauchi and Y. Matsuda
    • Organizer
      International Conference of Magnetism and Superconductivity (ICSM2012)
    • Place of Presentation
      Istanbul, Turkey
    • Related Report
      2011 Final Research Report
  • [Presentation] NMR Study of Magnetic Order and the FFLO State in CeCoIn_52011

    • Author(s)
      K. Kumagai
    • Organizer
      新学術領域研究「重い電子系の形成と秩序化」ワークショップ
    • Place of Presentation
      新潟大学
    • Related Report
      2011 Final Research Report
  • [Presentation] NMR Study of Magnetic Order and Spatially-Modulated Superconducting Gap in CeCoIn_52011

    • Author(s)
      K. Kumagai, H. Shishido, T. Shibauchi and Y.Matsuda
    • Organizer
      A special session on the application of μSR, NMR and LTXRD etc in condensed matter, Fall Meeting of Chinese Physical Society
    • Place of Presentation
      Hangzhou, China
    • Related Report
      2011 Final Research Report
  • [Presentation] Field Evolution of the FFLO Stateand Magnetism in CeCoIn_52011

    • Author(s)
      K. Kumagai, H. Shishido, T. Shibauchi and Y.Matsuda
    • Organizer
      International Conference on Ultra Low Temperature Physics
    • Place of Presentation
      KAIST, Daejeon, Republic of Korea
    • Related Report
      2011 Final Research Report
  • [Presentation] ^<27>Al-and ^<95>Mo-NMR Study on Noncentrosymmetric Superconductor Mo_3A_2C2011

    • Author(s)
      K. Kumagai, H. Shishido, T. Shibauchi and Y. Matsuda
    • Organizer
      26th International Conference on Low Temperature Physics
    • Place of Presentation
      Beijing, Chaina
    • Related Report
      2011 Final Research Report
  • [Presentation] NMR Study of the FFLO State and Magnetism in CeCoIn_52011

    • Author(s)
      K. Kumagai, H. Shishido, T. Shibauchi and Y. Matsuda
    • Organizer
      26th International Conference on Low Temperature Physics
    • Place of Presentation
      Beijing, Chaina
    • Related Report
      2011 Final Research Report
  • [Presentation] NMR Study of Magnetic Order and Spatially-Modulated Superconducting Gap inCeCoIn_52011

    • Author(s)
      K. Kumagai, H. Shishido, T. Shibauchi and Y.Matsuda
    • Organizer
      International Conference of Strongly Correlated Electron Systems
    • Place of Presentation
      Cambridge, UK
    • Related Report
      2011 Final Research Report
  • [Presentation] NMR study of magnetic order and FFLO state in CeCoIn_52010

    • Author(s)
      K. Kumagai, H. Shishido, and Y. Matsuda
    • Organizer
      International Conference on Strongly Correlated Electron Systems
    • Place of Presentation
      Santa Fe, USA
    • Related Report
      2011 Final Research Report
  • [Presentation] NMR Study of Magnetic Order and Spatially-Modulated Superconducting Gap in CeCoIn_52010

    • Author(s)
      K. Kumagai, H. Shishido, and Y. Matsuda
    • Organizer
      International Conference on Spectroscopes in Novel Superconductors
    • Place of Presentation
      Shanghai, China
    • Related Report
      2011 Final Research Report
  • [Presentation] NMR Study of Magnetically-Ordered Stateand Spatially-Modulated Superconducting Gapin CeCoIn_52010

    • Author(s)
      K. Kumagai, H. Shishido, and Y. Matsuda
    • Organizer
      International Conference on Superconductivity and Magnetism
    • Place of Presentation
      Antalya, Turkey
    • Related Report
      2011 Final Research Report
  • [Presentation] NMR study of a new superconducting phase in a strongly-correlated electron system of CeCoIn52010

    • Author(s)
      K.Kumagai
    • Organizer
      International Conference of Superconductivity and Magnetism (ICSM-2010)
    • Place of Presentation
      Porto Bello Hoel (Turkey)(招待講演)
    • Related Report
      2010 Annual Research Report
  • [Presentation] NMR Study of Magnetically-Ordered State in a Novel Superconducting Phase in CeCoIn_52009

    • Author(s)
      K. Kumagai, N. Kondoh, H. Shishido, and Y. Matsuda
    • Organizer
      9th International Conference on Materials and Mechanisms of Superconductivity
    • Place of Presentation
      Tokyo
    • Related Report
      2011 Final Research Report
  • [Presentation] NMR study of magnetic and superconducting order of CeCoIn_5 in a high field and low temperature phase2009

    • Author(s)
      K. Kumagai, N. Kondoh, H. Shishido, and Y. Matsuda
    • Organizer
      12th International Workshop on Vortex Matter in Superconductors
    • Place of Presentation
      Yamanaka Naito Seminar House, Lake Yamanaka, Japan
    • Related Report
      2011 Final Research Report
  • [Presentation] Magnetic Order inside the FFLO Phase in CeCoIn_52009

    • Author(s)
      K Kumagai
    • Organizer
      NATO Advanced Research Workshop on Physical Properties of Nano Systems, Yalta
    • Place of Presentation
      Ukraine, September
    • Related Report
      2011 Final Research Report
  • [Presentation] NMR study of magnetic and superconducting order of CeCoIn_5 in a high field and low temperature phase2009

    • Author(s)
      K.Kumagai
    • Organizer
      12th International Workshop on Vortex Matter in Superconductors(vortex 2009)
    • Place of Presentation
      Naito SeminarHouse, Lake Yamanaka, Yamanashi
    • Related Report
      2009 Annual Research Report
  • [Presentation] NMR study of Magnetically-Ordered State in a Novel Superconducting Phase in CeCoIn_52009

    • Author(s)
      K.Kumagai
    • Organizer
      9th International Conference on Materials]and Mechanisms of Superconductivity
    • Place of Presentation
      Tokyo, Japan
    • Related Report
      2009 Annual Research Report
  • [Presentation] Magnetic Order inside the FFLO Phase in CeCoIn_52009

    • Author(s)
      K.Kumagai
    • Organizer
      NATO Advanced Research Workshop on Physical Properties of Nano Systems
    • Place of Presentation
      Yalta, Ukraine
    • Related Report
      2009 Annual Research Report
  • [Presentation] NMR study of a FFLO state of CeColn_5 in a perpendicular and a parallel field2008

    • Author(s)
      K. Kumagai
    • Organizer
      6th International Conference of the STRIPES
    • Place of Presentation
      Erice, Italy
    • Related Report
      2008 Annual Research Report
  • [Presentation] NMR Study of a New Superconducting phase in a strongly-corre lated electron system of CeColn_52008

    • Author(s)
      K. Kumagai
    • Organizer
      International Conference of Superconductivityand Magnetism
    • Place of Presentation
      Side-Antalya, Turkey
    • Related Report
      2008 Annual Research Report

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Published: 2008-04-01   Modified: 2020-05-15  

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