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Sign-reversal of the in-plane resistivity anisotropy in hole-doped iron pnictides

Author

Listed:
  • E. C. Blomberg

    (The Ames Laboratory
    Iowa State University)

  • M. A. Tanatar

    (The Ames Laboratory
    Iowa State University)

  • R. M. Fernandes

    (School of Physics and Astronomy, University of Minnesota)

  • I. I. Mazin

    (Naval Research Laboratory)

  • Bing Shen

    (Institute of Physics, Chinese Academy of Sciences
    Nanjing University)

  • Hai-Hu Wen

    (Institute of Physics, Chinese Academy of Sciences
    Nanjing University)

  • M. D. Johannes

    (Naval Research Laboratory)

  • J. Schmalian

    (Institute for Theory of Condensed Matter Physics and Center for Functional Nanostructutes, Karlsruhe Institute of Technology)

  • R. Prozorov

    (The Ames Laboratory
    Iowa State University)

Abstract

Unconventional superconductivity usually originates from several strongly coupled degrees of freedom, such as magnetic, charge and elastic. A highly anisotropic electronic phase, not driven by lattice degrees of freedom, has been proposed in some of these superconductors, from cuprates to iron-based compounds. In the iron pnictide BaFe2As2, this nematic phase arises in the paramagnetic phase and is present for wide doping and temperature ranges. Here we probe the in-plane electronic anisotropy of electron- and hole-doped BaFe2As2 compounds. Unlike other materials, the resistivity anisotropy behaves very differently for electron- and hole-type dopants and even changes sign on the hole-doped side. This behaviour is explained by Fermi surface reconstruction in the magnetic phase and spin-fluctuation scattering in the paramagnetic phase. This unique transport anisotropy unveils the primary role played by magnetic scattering, demonstrating the close connection between magnetism, nematicity and unconventional superconductivity.

Suggested Citation

  • E. C. Blomberg & M. A. Tanatar & R. M. Fernandes & I. I. Mazin & Bing Shen & Hai-Hu Wen & M. D. Johannes & J. Schmalian & R. Prozorov, 2013. "Sign-reversal of the in-plane resistivity anisotropy in hole-doped iron pnictides," Nature Communications, Nature, vol. 4(1), pages 1-7, October.
    • Handle: RePEc:nat:natcom:v:4:y:2013:i:1:d:10.1038_ncomms2933
    DOI: 10.1038/ncomms2933
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