Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 54: Fe-based Superconductors

TT 54.9: Vortrag

Donnerstag, 19. März 2020, 11:45–12:00, HSZ 201

Field-dependent Elastoresistance in FeSe — •Michael Wissmann1, Federico Caglieris1, Steffen Sykora1, Saicharan Aswartham1, Sabine Wurmehl1, Bernd Büchner1,2,3, and Christian Hess1,31IFW Dresden — 2Institute for Solid State Physics, TU Dresden — 3Center for Transport and Devices, TU Dresden

In iron-based superconductors, nematicity has been proposed to be closely related to the emergence of superconductivity. The introduction of uniaxial strain as a tuning parameter has been established as an important tool to probe nematic fluctuations at temperatures higher than the structural transition temperature TS. This type of elastoresistance measurement has opened an exciting new route to understanding the interplay of nematicity, superconductivity and magnetism. However, the physical meaning of elastoresistance data for temperatures below TS is rarely discussed. Here, we investigate the elastoresistance-behaviour in low temperatures under application of external magnetic fields inside the nematic phase of iron selenide (FeSe). FeSe is, under many aspects, an exceptional representative of the iron-based-superconductor-class. We observe a strong field-dependence as well as a second divergence towards the superconducting phase. Various scenarios for the origin of this novel observations will be discussed.

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