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Elastocaloric determination of the phase diagram of Sr$_2$RuO$_4$

Li, You-Sheng; Garst, Markus ORCID iD icon 1; Schmalian, Jörg 2; Ghosh, Sayak; Kikugawa, Naoki; Sokolov, Dmitry A.; Hicks, Clifford W.; Jerzembeck, Fabian; Ikeda, Matthias S.; Hu, Zhenhai; Ramshaw, B. J.; Rost, Andreas W.; Nicklas, Michael ; Mackenzie, Andrew P.
1 Institut für Theoretische Festkörperphysik (TFP), Karlsruher Institut für Technologie (KIT)
2 Institut für Theorie der Kondensierten Materie (TKM), Karlsruher Institut für Technologie (KIT)

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 tuning, leading to experiments that have advanced our understanding of the fascinating unconventional superconductor Sr$_2$RuO$_4$. 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. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000149212
Veröffentlicht am 29.07.2022
Originalveröffentlichung
DOI: 10.1038/s41586-022-04820-z
Scopus
Zitationen: 18
Dimensions
Zitationen: 21
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für QuantenMaterialien und Technologien (IQMT)
Institut für Theoretische Festkörperphysik (TFP)
Institut für Theorie der Kondensierten Materie (TKM)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 14.07.2022
Sprache Englisch
Identifikator ISSN: 0028-0836, 1476-4687
KITopen-ID: 1000149212
HGF-Programm 47.11.02 (POF IV, LK 01) Emergent Quantum Phenomena
Erschienen in Nature
Verlag Nature Research
Band 607
Heft 7918
Seiten 276–280
Vorab online veröffentlicht am 13.07.2022
Nachgewiesen in Web of Science
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