Low Temperature Specific heat of U$_{2}$PtC$_{2}$

ORAL

Abstract

We present specific heat data of the moderately heavy superconductor U$_{2}$PtC$_{2}$ with T$_{\mathrm{c}} =$ 1.34 K, and normal state Sommerfeld coefficient $\gamma =$ C/T $\approx $ 150 mJ/mol K$^{2}$, at temperatures down to below 100 mK and in fields up to 9 T, exceeding the superconducting critical field. Zero-field data show systematic deviation from the weak-coupling BCS fit, with excess contribution at low temperature. The field evolution of the residual $\gamma _{0}$(T$=$0) shows $\surd $H dependence for H \textless 1 T. Together, these results suggest an unconventional nature of superconductivity in this compound.

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Authors

  • Roman Movshovich

    Los Alamos National Laboratory

  • Franziska Weickert

    Los Alamos National Laboratory

  • Eric D. Bauer

    Los Alamos Natl Lab, Los Alamos National Laboratory, Los Alamos National laboratory, Los Alamos, NM, 87544, USA

  • J. Thompson

    Los Alamos National Laboratory, Los Alamos Natl Lab

  • Ni Ni

    UCLA Physics \& Astronomy, Los Alamos National Laboratory, University of California, Los Angeles, Los Alamos National laboratory, Los Alamos, NM, 87544, USA

  • Filip Ronning

    Los Alamos Natl Lab, Los Alamos National Laboratory, Los Alamos National laboratory, Los Alamos, NM, 87544, USA