Anisotropy of electronic transport in the iron-pnictide superconductor Ba(Fe,Co)$_2$As$_2$

ORAL

Abstract

The anisotropy of electrical resistivity in the iron pnictide superconductor Ba(Fe,Co)$_2$As$_2$ has been studied using the Montgomery technique and direct transport measurements in single crystals cut along principal directions of the conductivity tensor (tetragonal c-axis and a-direction perpendicular to it). A good quantitative agreement is found between two sets of data, with a $\rho_c/ \rho_a$ anisotropy of 5 $\pm$ 1 just above the superconducting transition temperature. This is in very good agreement with expectations based on the anisotropy of the critical fields, suggestive of orbital limiting of superconductivity at T$_c$.

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Authors

  • M.A. Tanatar

    • Ames Laboratory

  • N. Ni

    • Ames Laboratory and Department of Physics and Astronomy, Iowa State University

  • C. Martin

    • Ames Laboratory

  • R.T. Gordon

    • Ames Laboratory and Department of Physics and Astronomy, Iowa State University

  • H. Kim

    • Ames Laboratory and Department of Physics and Astronomy, Iowa State University

  • V.G. Kogan

    • Ames Laboratory

  • G.D. Samolyuk

    • Ames Laboratory

  • S.L. Bud'ko

    • Ames Laboratory

  • P.C. Canfield

    • Ames Laboratory and Department of Physics and Astronomy, Iowa State University

  • R. Prozorov

    • Ames Laboratory and Department of Physics and Astronomy, Iowa State University