Elastocaloric determination of the phase diagram of Sr2RuO4

You-Sheng Li, Markus Garst, Jörg Schmalian, Sayak Ghosh, Naoki Kikugawa, Dmitry A. Sokolov, Clifford W. Hicks, Fabian Jerzembeck, Matthias S. Ikeda, Zhenhai Hu, B. J. Ramshaw, Andreas W. Rost, Michael Nicklas () and Andrew P. Mackenzie ()
Additional contact information
You-Sheng Li: Max Planck Institute for Chemical Physics of Solids
Markus Garst: Karlsruher Institut für Technologie
Jörg Schmalian: Karlsruher Institut für Technologie
Sayak Ghosh: Cornell University
Naoki Kikugawa: National Institute for Materials Science
Dmitry A. Sokolov: Max Planck Institute for Chemical Physics of Solids
Clifford W. Hicks: Max Planck Institute for Chemical Physics of Solids
Fabian Jerzembeck: Max Planck Institute for Chemical Physics of Solids
Matthias S. Ikeda: Stanford University
Zhenhai Hu: Max Planck Institute for Chemical Physics of Solids
B. J. Ramshaw: Cornell University
Andreas W. Rost: University of St Andrews
Michael Nicklas: Max Planck Institute for Chemical Physics of Solids
Andrew P. Mackenzie: Max Planck Institute for Chemical Physics of Solids

Nature, 2022, vol. 607, issue 7918, 276-280

Abstract: Abstract One of the main developments in unconventional superconductivity in the past two decades has been the discovery that most unconventional superconductors form phase diagrams that also contain other strongly correlated states. Many systems of interest are therefore close to more than one instability, and tuning between the resultant ordered phases is the subject of intense research1. In recent years, uniaxial pressure applied using piezoelectric-based devices has been shown to be a particularly versatile new method of tuning2,3, leading to experiments that have advanced our understanding of the fascinating unconventional superconductor Sr2RuO4 (refs. 4–9). Here we map out its phase diagram using high-precision measurements of the elastocaloric effect in what we believe to be the first such study including both the normal and the superconducting states. We observe a strong entropy quench on entering the superconducting state, in excellent agreement with a model calculation for pairing at the Van Hove point, and obtain a quantitative estimate of the entropy change associated with entry to a magnetic state that is observed in proximity to the superconductivity. The phase diagram is intriguing both for its similarity to those seen in other families of unconventional superconductors and for extra features unique, so far, to Sr2RuO4.

Date: 2022
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DOI: 10.1038/s41586-022-04820-z

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