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TT: Fachverband Tiefe Temperaturen

TT 37: Ruthenates

TT 37.1: Talk

Wednesday, March 29, 2023, 15:00–15:15, HSZ 201

Elastocaloric determination of the phase diagram of Sr₂RuO₄ — •You-Sheng Li¹, Markus Garst^2,3, Jörg Schmalian^3,4, Sayak Ghosh⁵, Naoki Kikugawa⁶, Dmitry Sokolov¹, Clifford Hicks^1,7, Fabian Jerzembeck¹, Matthias Ikeda⁸, Zhenhai Hu¹, Brad Ramshaw⁵, Andreas Rost⁹, Michael Nicklas¹, and Andrew Mackenzie^1,9 — ¹Max Planck Institute for Chemical Physics of Solids — ²Institut für Theoretische Festkörperphysik, Karlsruher Institut für Technologie — ³Institut für Quantenmaterialien und -technologien, Karlsruher Institut für Technologie — ⁴Institut für Theorie der Kondensierten Materie, Karlsruher Institut für Technologie — ⁵Laboratory of Atomic and Solid State Physics, Cornell University — ⁶National Institute for Materials Science — ⁷School of Physics and Astronomy, University of Birmingham — ⁸Department of Applied Physics, Stanford University — ⁹School of Physics and Astronomy, University of St Andrews

Uniaxial pressure has shown the capabilities of tuning the electronic structures of Sr₂RuO₄ across a Van Hove singularity (VHS). By performing high precision ac-elastocaloric effect (ECE) measurements under uniaxial strain along <100> direction, we mapped out the phase diagram of Sr₂RuO₄ in detail. Similar to many unconventional superconductors, Sr₂RuO₄ has a SC dome in proximity to a magnetic phase. Besides, we observe a strong reversal of the ECE around the VHS upon entering the SC state. Together with a model calculation, these results strongly suggest a node-less gap opening at the VHS and, thus, put a strong constraint on possible SC order parameters.