Berlin 2024 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 67: Unconventional Superconductors
TT 67.2: Vortrag
Donnerstag, 21. März 2024, 10:00–10:15, H 3007
Measurements of the elastocaloric effect on strained Sr2RuO4 in magnetic fields. — •Aleksei Frolov1, You-Sheng Li1, Naoki Kikugawa2, Andreas W. Rost3, Andrew P. Mackenzie1,3, and Michael Nicklas1 — 1Max Planck Institute for Chemical Physics of Solids, Dresden, Germany. — 2National Institute for Materials Science, Japan. — 3Scottish Universities Physics Alliance, School of Physics and Astronomy, University of St Andrews, St Andrews, UK
Recently, elastocaloric measurements under uniaxial stress have been shown to be a powerful tool for exploring the intriguing properties of the unconventional superconductor Sr2RuO4[1]. The results revealed an entropy peak in the normal state coinciding with the optimal superconducting Tc at the Van Hove strain, and traced an adjacent magnetic phase transition at higher strains. To study their interplay, thermodynamic measurements under magnetic field are highly desirable.
The aim of the present study was twofold: i) to investigate the phase diagram of the unconventional superconductor Sr2RuO4 in magnetic fields by thermodynamic means; ii) to extend the scope of the method for measuring the elastocaloric effect under uniaxial stress to high magnetic fields and to lower temperatures.
We have obtained high-resolution data on the elastocaloric effect in magnetic fields up to 16 T in a wide temperature range down to less than 1 K, providing new insights into the intriguing phase diagram of Sr2RuO4. We discuss the effect of the magnetic field on the superconducting and on the magnetic phase as well as their relationship.
[1] Y. S. Li et al., Nature 607 (2022) 276
Keywords: superconductivity; uniaxial strain; elastocaloric effect