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TT: Fachverband Tiefe Temperaturen
TT 24: Unconventional Superconductors
TT 24.3: Vortrag
Mittwoch, 19. März 2025, 10:15–10:30, H31
Investigating the strain dependence of the lower and upper superconducting critical fields in Sr2RuO4: A novel approach using elastocaloric effect measurements — •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
Elastocaloric measurements under uniaxial stress are an extremely sensitive technique that provides rich thermodynamic information. This is especially true when studying materials, such as the unconventional superconductor Sr2RuO4 [1]. In particular, the investigation of the elastocaloric effect in an applied magnetic field is challenging and pioneering, but highly relevant.
We have performed high resolution elastocaloric measurements on Sr2RuO4 in a magnetic field along the [001] axis with uniaxial stress applied in the [100] direction at low temperatures. We have studied the strain dependence of the lower and upper superconducting critical fields. Both show a dome-like shape with a maximum close to the Van Hove strain. We discuss the advantages and limitations of the elastocaloric technique compared to conventional probes such as electrical resistivity and susceptibility, highlighting its contribution to the understanding of unconventional superconductivity in Sr2RuO4.
[1] Y. S. Li et al., Nature 607, 276 (2022).
Keywords: superconductivity; uniaxial stress; Sr2RuO4