Dresden 2020 – wissenschaftliches Programm
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TT 16.14: Poster
Montag, 16. März 2020, 15:00–19:00, P2/EG
Electronic nematicity and thermal expansion in FeSe1−xSx — •Liran Wang1, Sven Sauerland1, Dmitriy Chareev2, Alexandre Vassiliev2, Michael Merz3, and Rüdiger Klingeler1 — 1Kirchhoff Institute of Physics, Heidelberg University, Germany — 2NRC Kurchatov institute, Moscow, Russie — 3Institute for Solid State Physics, Karlsruhe Institute of Technology, Germany
We report the study on electronic nematicity in pure and sulfer doped FeSe high quality single crystals by means of thermal expansion and shear modulus measurements. Clear anomalies in the thermal expansivity are observed at both the magneto-structural and superconducting transition. By means of the three-point bending technique in the capacitance dilatometer, we obtain the nematic susceptibility from the shear modulus response. The shear modulus softens well above Ts implying a Curie-Weiss-like behaviour of the nematic susceptibility. Sulfur-doping suppresses Ts but no clear effect on Tc can be found. The evolution of the nematic phase as well as of nematic fluctuations is mapped out towards the superconducting regime. The relation between the nematic susceptibility and spin, structure and orbital degrees of freedom is discussed.