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Regensburg 2019 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 5: Superconductivity: Fe-based Superconductors - FeSe and 122

TT 5.13: Talk

Monday, April 1, 2019, 12:45–13:00, H23

Nematic susceptibility in heavily hole-doped iron-based superconductors — •Xiaochen Hong1, Saicharan Aswartham1, Igor Morozov1,2, Steffen Sykora1, Federico Caglieris1, Silvia Seiro1, Bernd Büchner1,3,4, and Christian Hess1,41Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden (IFW-Dresden), Dresden, Germany — 2Department of Chemistry, Lomonosov Moscow State University, Moscow, Russia — 3Institute of Solid State Physics, TU Dresden, Dresden, Germany — 4Center for Transport and Device, TU Dresden, Dresden, Germany

Unconventional superconductivity typically is closely related to the suppression of ordered states which possibly compete or coexist with superconductivity in the underdoped region. The overdoped systems are usually assumed to stay in a rather conventional Fermi liquid state. However, for iron-based superconductors, experiments indicate that the heavily hole-doped end-member KFe2As2, together with its sister compounds, are more complicated including the possibility of emerging electronic nematic order.

We present elasto-resistivity measurements of KFe2As2, revealing a divergent nematic susceptibility. The evolution of nematic susceptibility is also tracked with isovalent doping and electron doping on the K site. Our results point to unexpected nematic critical point(s) in those overdoped superconductors.

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