SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 16: Poster: Transport

TT 16.20: Poster

Montag, 27. März 2023, 15:00–18:00, P2/OG4

Nematic susceptibility in heavily hole-doped iron based superconductors — •Franz Eckelt¹, Xiaochen Hong¹, Vilmos Kocsis², Vadim Grinenko², Chul-Ho Lee³, Bernd Büchner², and Christian Hess¹ — ¹Bergische Universität Wuppertal, 42097 Wuppertal, Germany — ²Leibniz-Institute for Solide State and Materials Research (IFW-Dresden), 01069 Dresden, Germany — ³National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan

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 [100] 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.