Point-Contact Andreev Reflection Spectroscopy in Pt-Substituted BaFe2As2

ORAL

Abstract

We have investigated the superconducting order parameter of BaFe2-xPtxAs2 using point-contact Andreev reflection spectroscopy (PCAR). The samples used were large single crystals with measured Pt concentrations consistent with optimal doping (x = 0.15). Junctions were made between gold or lead tips and the c-axis of the superconducting samples. Conductivity spectra were measured over a range of temperatures and fit to curves generated using the Blonder-Tinkham-Klapwijk (BTK) model for two gaps, one isotropic and one angle-dependent gap with nodes.

*Center for Nanophysics and Advanced Materials, Physics Department, University of Maryland, College Park

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Authors

  • Steven Ziemak

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

  • Xiaohang Zhang

    • National Institute of Standards and Technology

  • Tyler Drye

    • University of Maryland

  • Richard Greene

    • University of Maryland

  • Johnpierre Palione

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