Regensburg 2025 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 11: Superconductivity: Poster

TT 11.15: Poster

Monday, March 17, 2025, 15:00–18:00, P4

Nematic susceptibility in heavily hole-doped iron based superconductors — •Franz Eckelt¹, Xiaochen Hong², Vilmos Kocsis³, Vadim Grinenko⁴, Bernd Büchner², Christian Hess¹, Chul-Ho Lee⁵, and Kunihiro Kihou⁵ — ¹Bergische Universität Wuppertal, 42097 Wuppertal, Germany — ²College of Physics and Center of Quantum Materials and Devices, Chongqing University, 401331 Chongqing, China — ³Leibnitz-Institut for Solide State and Materials Research, 01069 Dresden, Germansy — ⁴Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai 201210, China — ⁵National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki, 305-8568, Japan

We investigate the elastoresistivity of 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 the amplitude of which possesses a strong non-montonic doping dependence. We discuss our results in terms of nematic fluctuations, Fermi surface effects near a Lifshitz transition, and a potential orbital-selective Mott transition.

Keywords: Nematic phase; Superconductors; Elastoresistance measurements