SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 37: Ruthenates

TT 37.5: Vortrag

Mittwoch, 29. März 2023, 16:00–16:15, HSZ 201

Effect of superconductivity on the stress-strain relationships of Sr₂RuO₄ — •Kousuke Ishida¹, Hilary Noad¹, You-sheng Li¹, Veronika Stangier², Naoki Kikugawa³, Dmitry Sokolov¹, Michael Nicklas¹, Markus Garst², Jörg Schmalian², Andrew Mackenzie^1,4, and Clifford Hicks^1,5 — ¹Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — ²Karlsruhe Institute of Technology, Karlsruhe, Germany — ³National Institute for Materials Science, Tsukuba, Japan — ⁴University of St. Andrews, St. Andrews, United Kingdom — ⁵University of Birmingham, Birmingham, United Kingdom

In the unconventional superconductor Sr₂RuO₄, applying uniaxial stress along a ⟨100⟩ crystalline direction induces a Lifshitz transition. Here we report on measurement of the stress-strain relationships across this transition down to temperatures below the superconducting transition. In the normal state, the Young’s modulus softens by ≈10 % in the vicinity of the Lifshitz transition, indicating that this is a local maximum in the electronic free energy. We find that the onset of superconductivity causes a slight hardening of the lattice, though the electronic free energy remains a local maximum at the Lifshitz transition.