Angular dependent magnetorestriction study of CeCoIn$_{5}$

ORAL

Abstract

Using a capacitive dilatometer designed to operate on the rotating stage of a top loading dilution refrigerator probe, we measured the magnetorestriction $\left( L(H)-L(0)\right)/L(0)$, of the Heavy Fermion Superconductor CeCoIn$_5$, along all three crystallographic direction, and with the magnetic field applied parallel both to the superconducting \textit{ab}-planes and to the \textit{c}-axis. When $B||\textit{ab}$, the \textit{c}-axis magnetorestriction features, besides a sharp jump at the upper critical field, a continuous, second-order like, transition at a lower field, which is consistent with previous observations from specific heat measurements. Our results are consistent with a field induced modulation of the superconducting order parameter (FFLO state), rather than with a field induced magnetic ordering.

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Authors

  • Catalin Martin

    • National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA

  • Victor. F. Correa

    • National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA

  • Kenneth M. Purcell

    • National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA

  • Timothy P. Murphy

    • National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA

  • Eric C. Palm

    • National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA

  • Stan Tozer

    • National High Magnetic Field Laboratory, Florida State University
    • National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA
    • National High Magnetic Field Laboratory, Tallahassee

  • George M. Schmiedeshoff

    • Department of Physics, Occidental College, Los Angeles, California, 90041

  • J. C. Cooley

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