Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 98: Poster Session: Superconductivity
TT 98.11: Poster
Donnerstag, 15. März 2018, 15:00–19:00, Poster B
Evolution of the nematic susceptibility in a superconducting dome without structural transition — •Xiaochen Hong1, Rhea Kappenberger1, Federico Caglieris1, Saicharan Aswartham1, Bernd Büchner1,2,3, and Christian Hess1,3 — 1IFW-Dresden, Dresden, Germany — 2Institute of Solid State Physics, TU Dresden, Germany — 3Center for Transport and Devices, TU Dresden, Germany
The first step towards understanding the mechanism of the mysterious high-temperature superconductivity is to clarify the phase diagram of these compounds. The superconducting transition temperature of them always show dome-shaped dependence on tuning parameter(s). In the case of iron based superconductors (FeSC), a prevailing picture is that magnetic, structural and nematic transition are all entangled into the dome. Among these orders, the one which is "on the driver seat" should be most relevant to the formation of Cooper pairs.
Recently, an elegant technique based on piezoelectric apparatus was introduced to study the nematic susceptibility. Soon after, signatures of a nematic quantum critical point were found in many FeSCs by this technique. Here we present our study on cobalt doped LaOFeAs, which does not exhibit a structural transition inside its superconducting dome. We observe a divergent nematic susceptibility across the dome which peaks near the optimal doping. Our finding strongly suggest that the nematic fluctuation is intimately related to the superconductivity in FeSCs.