Low-temperature thermal transport properties of BaNi$_2$As$_2$

ORAL

Abstract

Low-temperature specific heat $C$($T$) and thermal conductivity $\kappa$($T$) measurements under magnetic field have been performed on a recently discovered Ni-based superconductor BaNi$_2$As$_2$ ($T_{\mathrm{c}}$\,=\,0.7\,K). In zero field, $\kappa$($T$) shows $T$-linear behavior in the normal state and exhibits a BCS-like exponential decrease below $T_{\mathrm{c}}$. The field dependence of the residual thermal conductivity extrapolated to zero temperature is indicative of a fully gapped superconductor. This conclusion is supported by the analysis of $C$($T$) data, which are well fit based on the BCS theory.

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Authors

  • N. Kurita

    • Los Alamos National Laboratory
    • LANL, Los Alamas, NM, USA
    • Los Alamos National Laboratory, Los Alamos, NM 87544, USA

  • F. Ronning

    • Los Alamos National Laboratory
    • LANL, Los Alamas, NM, USA
    • Los Alamos National Laboratory, Los Alamos, NM 87544, USA

  • Y. Tokiwa

    • Los Alamos National Laboratory
    • Los Alamos National Laboratory, Los Alamos, NM 87544, USA

  • E.D. Bauer

    • Los Alamos National Laboratory
    • Los Alamos Natl. Lab., NM, USA
    • Los Alamos National Laboratory, Los Alamos, NM 87544, USA

  • Alaska Subedi

    • Oak Ridge National Laboratory and University of Tennessee
    • Materials Science and Technology Division, ORNL

  • David Singh

    • Oak Ridge National Laboratory
    • Material Science and Technology Division, Oak Ridge National Lab
    • Materials Science and Tech. Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831, USA
    • Materials Science and Technology Division, ORNL

  • Joe D. Thompson

    • Los Alamos National Laboratory

  • R. Movshovich

    • Los Alamos National Laboratory
    • LANL, Los Alamas, NM, USA
    • Los Alamos National Laboratory, Los Alamos, NM 87544, USA