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Topology change of the Landau Fermi surface in CeCoIn<sub>5</sub>.

ORAL

Abstract

The high-field/low temperature state of CeCoIn5 (so-called Q-phase) is an intertwined dx2-y2-wave superconducting order, a p-wave superconducting pair density wave (PDW), and a magnetically ordered spin-density-wave (SDW) [1]. When magnetic field is oriented within the a-b plane, the SDW ordering wave vector QSDW lies in one of the nodal directions of the

dx2-y2-wave order parameter. We performed thermal conductivity measurement with magnetic field rotating within the a-b plane, both inside the intertwined phase (above 10 T) and a single d-wave SC phase (below 10 T) at low temperatures. The heat current was applied in the [100] direction of an anti-node of the superconducting order parameter. Above 7 T we observe a fine structure in thermal conductivity in rotating field, with multiple small oscillations in both phases. However, the phase of these oscillations changes by as much as π between the two states.  This can be understood in terms of the change of the topology of the Landau Fermi surface, as the SDW and the PDW gap nodes of the dx2-y2 order parameter.

 [1] Duk Y. Kim et al., “Intertwined Orders in Heavy-Fermion Superconductor CeCoIn5”, Phys. Rev. X 6, 041059 (2016)

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Presenters

  • Sangyun Lee

    Los Alamos National Laboratory, 87544 New Maxico, U.S.A, Los Alamos National Laboratory

Authors

  • Sangyun Lee

    Los Alamos National Laboratory, 87544 New Maxico, U.S.A, Los Alamos National Laboratory

  • Duk Y Kim

    Center for Integrated Nanostructure Physics (CINAP)

  • Andrew J Woods

    University of Florida, Los Alamos National Laboratory

  • Eric D Bauer

    Los Alamos Natl Lab, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, U.S.A., Los Alamos National Laboratory, Los Alamos, New Mexico, 87545, USA

  • Filip Ronning

    Los Alamos Natl Lab, Los Alamos National Laboratory, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, U.S.A., Los Alamos National Laboratory, Los Alamos, New Mexico, 87545, USA

  • Shizeng Lin

    Los Alamos National Laboratory, Los Alamos National Laboratory, Los Alamos, New Mexico, 87545, USA

  • Roman Movshovich

    Los Alamos National Lab, Los Alamos Natl Lab