Evolution of FFLO state of CeCo(In$_{1-x}$Cd$_{x})_{5}$

ORAL

Abstract

Unconventional superconductor CeCoIn$_{5}$ at high magnetic field displays first order superconducting transition and an additional high field-low temperature superconducting phase (previously proposed to be an inhomogeneous superconducting FFLO state). Both phenomena were attributed to strong Pauli limiting effects. Our specific heat measurements on low Cd-doping (for In) samples, at fields close to the superconducting critical field $H_{c2}$, show that superconducting transition remains first order for samples with $H_{c2}$ up to 5.7 T (from 4.95 T in a pure compound), for field out of plane orientation ($H \quad \vert \vert $ c). We discuss systematic evolution of the proposed FFLO state with Cd content.

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Authors

  • Yoshifumi Tokiwa

    • Los Alamos National Lab
    • Los Alamos National Laboratory

  • Filip Ronning

    • Condensed Matter and Thermal Physics, MPA, Los Alamos National Laboratory, Los Alamos, NM
    • Los Alamos National Laboratory
    • Los Alamos National Lab

  • Joe Thompson

    • Los Alamos National Laboratory
    • Condensed Matter and Thermal Physics, MPA, Los Alamos National Laboratory, Los Alamos, NM
    • Condensed Matter and Thermal Physics, Los Alamos National Laboratory, USA
    • Los Alamos National Lab.
    • MPA-CMTP, LANL
    • Los Alamos National Lab
    • Los Alamos Nat. Lab.

  • Roman Movshovich

    • Los Alamos National Lab
    • Los Alamos National Laboratory

  • Long Pham

    • University of California, Davis

  • Zachary Fisk

    • Dept. Phys. \& Astro., UC Irvine, Irvine, CA, USA
    • University of California, Irvine