Elastocaloric determination of the phase diagram of Sr 2 RuO 4 .

Autor: Li YS; Max Planck Institute for Chemical Physics of Solids, Dresden, Germany., Garst M; Institut für Theoretische Festkörperphysik, Karlsruher Institut für Technologie, Karlsruhe, Germany.; Institut für QuantenMaterialien und Technologien, Karlsruher Institut für Technologie, Karlsruhe, Germany., Schmalian J; Institut für QuantenMaterialien und Technologien, Karlsruher Institut für Technologie, Karlsruhe, Germany.; Institut für Theorie der Kondensierten Materie, Karlsruher Institut für Technologie, Karlsruhe, Germany., Ghosh S; Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, NY, USA., Kikugawa N; National Institute for Materials Science, Tsukuba, Japan., Sokolov DA; Max Planck Institute for Chemical Physics of Solids, Dresden, Germany., Hicks CW; Max Planck Institute for Chemical Physics of Solids, Dresden, Germany.; School of Physics and Astronomy, University of Birmingham, Birmingham, UK., Jerzembeck F; Max Planck Institute for Chemical Physics of Solids, Dresden, Germany., Ikeda MS; Geballe Laboratory for Advanced Materials, Stanford University, Stanford, CA, USA.; Department of Applied Physics, Stanford University, Stanford, CA, USA.; Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, USA., Hu Z; Max Planck Institute for Chemical Physics of Solids, Dresden, Germany., Ramshaw BJ; Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, NY, USA., Rost AW; Scottish Universities Physics Alliance, School of Physics and Astronomy, University of St Andrews, St Andrews, UK.; Max Planck Institute for Solid State Research, Stuttgart, Germany., Nicklas M; Max Planck Institute for Chemical Physics of Solids, Dresden, Germany. Michael.Nicklas@cpfs.mpg.de., Mackenzie AP; Max Planck Institute for Chemical Physics of Solids, Dresden, Germany. Andy.Mackenzie@cpfs.mpg.de.; Scottish Universities Physics Alliance, School of Physics and Astronomy, University of St Andrews, St Andrews, UK. Andy.Mackenzie@cpfs.mpg.de.
Jazyk: angličtina
Zdroj: Nature [Nature] 2022 Jul; Vol. 607 (7918), pp. 276-280. Date of Electronic Publication: 2022 Jul 13.
DOI: 10.1038/s41586-022-04820-z
Abstrakt: 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 research 1 . In recent years, uniaxial pressure applied using piezoelectric-based devices has been shown to be a particularly versatile new method of tuning 2,3 , leading to experiments that have advanced our understanding of the fascinating unconventional superconductor Sr 2 RuO 4 (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 Sr 2 RuO 4 .
(© 2022. The Author(s).)
Databáze: MEDLINE
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