Regensburg 2013 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 12: Poster Session Superconductivity

TT 12.50: Poster

Montag, 11. März 2013, 15:00–19:00, Poster D

Competing instabilities in FeSe/SrTiO₃ superlattices — •Michael Fechner and Nicola Spaldin — ETH Zurich, Department for Material Theory,CH-8093 Zurich, Switzerland

Intercalating FeSe with atomic layers[1] has recently experimentally been shown to lead to an tremendous increase in the superconducting T_C. Due to that we discuss here results from first-principle calculations of FeSe/SrTiO₃ superlattices. In particular we discuss the competition between lattice instabilities in SrTiO₃ and the spin density wave (SDW) in FeSe. It turns out that depending on the interface termination a suppression or enhancement of the SDW is found. Interface doping and hybridization of Fe-oxygen and Ti-Se at the interface explain the results. Finally we discuss the impact of different thicknesses of the two components on the magnetic and electronic properties.
[1] M. Burrard-Luca et al., NatMat 11, 1 (2012).