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TT: Fachverband Tiefe Temperaturen

TT 18: Superconductivity: Poster

TT 18.14: Poster

Monday, March 18, 2024, 15:00–18:00, Poster C

Nematic susceptibility in heavily hole-doped iron based superconductors — •Franz Eckelt¹, Xiaochen Hong¹, Vilmos Kocsis², Bernd Büchner², Vadim Grinenko³, and Christain Hess¹ — ¹Bergische Universität Wuppertal, Wuppertal, Germany — ²Leibniz-Institute for Solide State and Materials Research (IFW-Dresden), 01069 Dresden, Germany — ³Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai, China

We investigate the elastoresistivity of the heavily hole doped iron-based superconductor Ba_1−xK_xFe₂As₂ in the range x= 0.68 - 0.98 using a piezoelectric measurement technique. We observe a divergent increase in elastoresistance along the [110] direction during cooling for all samples studied so far. We discuss our findings in terms of nematic fluctuations and Fermi surface effects in the vicinity of a Lifshitz transition.

Keywords: Nematic phase; Superconductors; Elastoresistance measurements