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 Morozov^1,2, Steffen Sykora¹, Federico Caglieris¹, Silvia Seiro¹, Bernd Büchner^1,3,4, and Christian Hess^1,4 — ¹Leibniz-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.