Isotropic superconducting gap structure in BaFe1.90Pt0.10As2 from low temperature thermal conductivity

ORAL

Abstract

In this study we present measurements of thermal transport down to 50 mK in single crystals of the iron-based superconductor BaFe1.90Pt0.10As2 with Tc $=$ 23 K [1]. Magnetic fields up to 15 T were applied along the c-axis of the crystal as well as along the basal plane direction to probe the anisotropy of the superconducting gap. The lack of any significant residual electronic term in thermal conductivity for all field directions and values confirms the absence of nodes and places limits on the depth of gap minima in this system.\\[4pt] [1] S.R. Saha et al, JPCM 22 072204 (2010).

*This work was supported by AFOSR-MURI FA9550-09-1-0603 and by an ICMR fellowship.

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Authors

  • Kevin Kirshenbaum

    • Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park, MD 20742
    • Center for Nanophysics and Advanced Materials, Dept. of Physics, University of Maryland, College Park

  • Shanta Saha

    • National Institute for Standards and Technology, Gaithersburg, MD

  • Steven Ziemak

    • Center for Nanophysics and Advanced Materials, Dept. of Physics, University of Maryland, College Park

  • Rongwei Hu

    • Center for Nanophysics and Advanced Materials, Dept. of Physics, University of Maryland, College Park

  • Jean-Philippe Reid

    • Universite de Sherbrooke, Sherbrooke, QC

  • Ryan Gordon

    • Universite de Sherbrooke, Sherbrooke, QC

  • Louis Taillefer

    • Universite de Sherbrooke, Sherbrooke, QC

  • Johnpierre Paglione

    • Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland-College Park
    • Ceter for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park, MD 20742
    • University of Maryland
    • Department of Physics, University of Maryland
    • Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park, MD 20742
    • Center for Nanophysics and Advanced Materials, Dept. of Physics, University of Maryland, College Park