Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 52: Superconductivity: Fe-based Superconductors – FeSe and others
TT 52.4: Vortrag
Mittwoch, 18. März 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 Büchner1,3 — 1IFW 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.