Infrared Faraday measurements on Ba(Fe$_{\mathrm{1-x}}$Co$_{\mathrm{x}}$)$_{2}$As$_{2}$ superconductors

ORAL

Abstract

We report infrared Faraday measurements on electron-doped Ba(Fe$_{\mathrm{1-x}}$Co$_{\mathrm{x}}$)$_{2}$As$_{2}$ superconducting films, which are grown by pulsed laser deposition. The complex Faraday angle $\theta_{\mathrm{F}}$ is proportional to the difference of the sample's response to right and left circularly polarized light, making it a highly sensitive tool to probe electronic structure, electron-electron correlations, and magnetic ordering. We measure $\theta _{\mathrm{F}}$ for normal and superconducting states in the 110-1400 meV range at temperatures down to 10K and magnetic fields up to 7T. This work is supported by NSF-DMR1006078.

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Authors

  • Alok Mukherjee

    Dept. of Physics, University at Buffalo, The State University of New York, Buffalo, NY, Department of Physics, University at Buffalo, SUNY

  • N. Tesarova

    Dept. of Physics, University at Buffalo, The State University of New York, Buffalo, NY, Faculty of Mathematics and Physics, Charles University in Prague

  • M. Murat Arik

    Dept. of Physics, University at Buffalo, The State University of New York, Buffalo, NY, Department of Physics, University at Buffalo, SUNY

  • J. Cerne

    Dept. of Physics, University at Buffalo, The State University of New York, Buffalo, NY, Department of Physics, University at Buffalo, SUNY

  • Hikaru Sato

    Materials and Structures Laboratory, Tokyo Institute of Technology, Tokyo, Japan

  • Hidenori Hiramatsu

    Materials and Structures Laboratory, Tokyo Institute of Technology, Tokyo, Japan

  • Hideo Hosono

    Materials and Structures Laboratory, Tokyo Institute of Technology, Tokyo, Japan