Point-Contact Andreev Reflection Spectroscopy of Iron-Based Superconductors

ORAL

Abstract

We carry out point-contact Andreev reflection spectroscopic studies at cryogenic temperatures on single crystals of Fe-chalcogenide and Fe-pnictide superconductors, including FeS$_{1-x}$Te$_{x}$, FeSe$_{1-x}$Te$_{x}$, SrFe$_{1.84}$Pt$_{0.16}$As$_{2}$ and BaFe$_{1.9}$Pt$_{0.1}$As$_{2}$. Our data are analyzed using current theoretical models involving multiband superconductivity. Further interpretations will be made in comparison with scanning tunneling spectroscopy measurements on Fe-chalcogenides and NbSe$_{2}$. *Present address: Ames Laboratory, Iowa State University

*Work supported by NSERC, CFI/OIT, Taiwan National Science Council, AFOSR-MURI Grant FA9550-09-1-0603, U.S. D.O.E. and Brookhaven Science Associates (No.DE-Ac02-98CH10886), and Center for Emergent Superconductivity

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Authors

  • Yi-Tang Yen

    • University of Toronto and Canadian Institute for Advanced Research

  • J.Y.T. Wei

    • University of Toronto and Canadian Institute for Advanced Research

  • S.R. Saha

    • Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland

  • T. Drye

    • Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland

  • K. Kirshenbaum

    • Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland

  • J. Paglione

    • Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland

  • Rongwei Hu*

    • Brookhaven National Laboratory

  • C. Petrovic

    • Brookhaven National Laboratory

  • K.W. Yeh

    • Institute of Physics, Academia Sinica, Taiwan

  • M.K. Wu

    • Institute of Physics, Academia Sinica, Taiwan