Specific Heat vs Field in the 30 K Superconductor BaFe$_{2}$(As$_{0.7}$P$_{0.3})_{2}$

ORAL

Abstract

Recently, superconductivity at 30 K has been reported [1] in P-doped BaFe$_{2}$As$_{2}$, with 1/3 of the As replaced by P. Magnetic penetration and thermal conductivity measurements [2] indicate a nodally gapped superconductor. We report here on measurements of the specific heat divided by temperature, C/T, as a function of field up to 15 T and down to 0.4 K in order to further investigate the nodal structure with another probe. \\[4pt] [1] S. Kasahara, et al., arXiv0905.4427. \\[0pt] [2] K. Hashimoto, et al., arXiv0907.4399.

*Work at Florida supported by the US DOE contract no. DE-FG02-86ER45268 (JSK and GRS) and DE-FG02-05ER46236 (PJH).

–

Authors

  • G.R. Stewart

    • Physics/University of Florida

  • J.S. Kim

    • Physics/University of Florida

  • Peter Hirschfeld

    • University of Florida
    • Physics/University of Florida
    • Department of Physics, University of Florida, Gainesville, Florida 32611, USA

  • Shigeru Kasahara

    • LTM Center/Kyoto University

  • Takasada Shibauchi

    • Physics/Kyoto University
    • Kyoto University, Kyoto Japan

  • T. Terashima

    • LTM Center/Kyoto University

  • Yuji Matsuda

    • Physics/Kyoto University
    • Department of Physics, Kyoto University, Kyoto 606-8502, Japan
    • Kyoto University, Kyoto Japan