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Anisotropy of the dc conductivity due to orbital-selective spin fluctuations in the nematic phase of iron superconductors

AuthorsFernández-Martín, Raquel; Fanfarillo, Laura; Benfatto, Lara; Valenzuela, Belén
Issue Date2019
PublisherAmerican Physical Society
CitationPhysical Review B 99 (2019)
Abstract[EN] We study the dc conductivity of iron-based superconductors within the orbital-selective spin fluctuation scenario. Within this approach, the anisotropy of spin fluctuations below the spin-nematic transition at TS is also responsible for the orbital ordering, induced by nematic self-energy corrections to the quasiparticle dispersion. As a consequence, the anisotropy of the dc conductivity below TS is determined not only by the anisotropy of the scattering rates as expected within a spin-nematic scenario, but also by the modification of the Fermi velocity due to the orbital reconstruction. More interestingly, it turns out that these two effects contribute to the dc-conductivity anisotropy with opposite signs. By using realistic band-structure parameters we compute the conductivity anisotropy for both 122 and FeSe compounds, discussing the possible origin of the different dc-conductivity anisotropy observed experimentally in these two families of iron-based superconductors.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevB.99.155117
Identifiersdoi: 10.1103/PhysRevB.99.155117
e-issn: 2469-9969
issn: 2469-9950
Appears in Collections:(ICMM) Artículos
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