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

TitleSign-reversal of the in-plane resistivity anisotropy in hole-doped iron pnictides
Publication TypeJournal Article
Year of Publication2013
AuthorsBlomberg, EC, Tanatar, MA, Fernandes, RM, Mazin, II, Shen, B, Wen, HH, Johannes, MD, Schmalian, J, Prozorov, R
JournalNature Communications
Date Published05
Type of ArticleArticle
ISBN Number2041-1723
Accession NumberWOS:000320589900110
Keywordselectronic 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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