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Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 35: Superconductivity: Fe-based Superconductors - 122 and Theory

TT 35.13: Vortrag

Dienstag, 13. März 2018, 12:45–13:00, A 053

Enhanced Nernst effect by nematic fluctuations in an iron based superconductor — •Steffen Sykora1, Christoph Wuttke1, Federico Caglieris1, Bernd Büchner1,2,3, and Christian Hess1,31IFW Dresden, 01069 Dresden, Germany — 2Institute for Solid State Physics, TU Dresden, 01069 Dresden, Germany — 3Center for Transport and Devices, TU Dresden, 01069 Dresden, Germany

Nematic fluctuations are expected to enhance superconductivity in iron based superconductors which undergo a transition to nematic order. Motivated by recent Nernst effect measurements we investigate theoretically transport properties within a minimal electronic model consisting of two orbitals, with interactions that enhance nematic fluctuations. We apply a many-particle renormalization method to calculate current-current correlation functions and show that the correlation between currents in perpendicular directions are particularly enhanced by interactions between different orbitals. This property gives rise to a direct coupling of the Nernst effect to nematic fluctuations. We discuss our results in the context of recent Nernst effect experiments in BaFe2As2.

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