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

E. C. Blomberg, M. A. Tanatar, R. M. Fernandes, I. I. Mazin, Bing Shen, Hai-Hu Wen, M. D. Johannes, J. Schmalian and R. Prozorov ()
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E. C. Blomberg: The Ames Laboratory
M. A. Tanatar: The Ames Laboratory
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
Hai-Hu Wen: Institute of Physics, Chinese Academy of Sciences
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

Nature Communications, 2013, vol. 4, issue 1, 1-7

Abstract: 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.

Date: 2013
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DOI: 10.1038/ncomms2933

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