|Title||Sign-reversal of the in-plane resistivity anisotropy in hole-doped iron pnictides|
|Publication Type||Journal Article|
|Year of Publication||2013|
|Authors||Blomberg, EC, Tanatar, MA, Fernandes, RM, Mazin, II, Shen, B, Wen, HH, Johannes, MD, Schmalian, J, Prozorov, R|
|Type of Article||Article|
|Keywords||electronic nematicity, high-temperature superconductivity, scattering, transition|
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.
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