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