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  Elastocaloric determination of the phase diagram of Sr2RuO4

Li, Y.-S., Garst, M., Schmalian, J., Ghosh, S. G., Kikugawa, N., Sokolov, D. A., et al. (2022). Elastocaloric determination of the phase diagram of Sr2RuO4. Nature, 607(7918), 276-280. doi:10.1038/s41586-022-04820-z.

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 Creators:
Li, You-Sheng1, Author           
Garst, Markus2, Author
Schmalian, Jörg2, Author
Ghosh, Sayak Ghosh2, Author
Kikugawa, Naoki2, Author
Sokolov, Dmitry A.1, Author           
Hicks, Clifford W.3, Author           
Jerzembeck, Fabian1, Author           
Ikeda, Matthias S.2, Author
Hu, Zhenhai1, Author           
Ramshaw, B. J.2, Author
Rost, Andreas W.2, Author
Nicklas, Michael4, Author           
Mackenzie, Andrew P.5, Author           
Affiliations:
1Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              
2External Organizations, ou_persistent22              
3Clifford Hicks, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863466              
4Michael Nicklas, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863472              
5Andrew Mackenzie, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863463              

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Free keywords: correlation, diagram, entropy, experimental study, pressure, research work, superconductivity, entropy, magnetism, superconductivity, Entropy, Magnetics, Superconductivity
 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. © 2022, The Author(s).

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Language(s): eng - English
 Dates: 2022-07-132022-07-13
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1038/s41586-022-04820-z
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Title: Nature
  Alternative Title : Nature
Source Genre: Journal
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Publ. Info: Nature Research
Pages: - Volume / Issue: 607 (7918) Sequence Number: - Start / End Page: 276 - 280 Identifier: ISBN: 00280836 (ISSN)