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SKM 2023 – scientific programme

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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 Garst2,3, Jörg Schmalian3,4, Sayak Ghosh5, Naoki Kikugawa6, Dmitry Sokolov1, Clifford Hicks1,7, Fabian Jerzembeck1, Matthias Ikeda8, Zhenhai Hu1, Brad Ramshaw5, Andreas Rost9, Michael Nicklas1, and Andrew Mackenzie1,91Max 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.

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