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Berlin 2015 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 52: Superconductivity: Fe-based Superconductors – FeSe and others

TT 52.4: Talk

Wednesday, March 18, 2015, 10:15–10:30, H 2053

Orbital-driven nematicity in FeSe — •Seung-Ho Baek1, Dmitry Efremov1, Jong Mok Ok2, Junsung Kim2, Jeroen van den Brink1,3, and Bernd Büchner1,31IFW Dresden, Helmholtzstr. 20, 01069 Dresden, Germany — 2Department of Physics, Pohang University of Science and Technology, Pohang, Korea — 3Technische Universität Dresden, 01062 Dresden, Germany

An important feature in Fe-based superconductors is that superconductivity occurs in the vicinity of nematic ordering - a lowering of the rotational symmetry preserving time-reversal invariance - as well as of magnetic order. The origin of the nematic symmetry breaking has been heavily debated, because lattice, orbital, and spin degrees of freedom are all directly linked one another from a symmetry point of view, and thus it is challenging to establish which ordering is primary. In this talk, I will present nuclear magnetic resonance (NMR) studies of the high-quality FeSe single crystals, demonstrating that orbital degrees of freedom drives the nematic order.

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