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High-sensitivity heat-capacity measurements on Sr₂RuO₄under uniaxial pressure

Li, You-Sheng; Kikugawa, Naoki; Sokolov, Dmitry A.; Jerzembeck, Fabian; Gibbs, Alexandra S.; Maeno, Yoshiteru; Hicks, Clifford W.; Schmalian, Jörg; Nicklas, Michael; Mackenzie, Andrew P.

Abstract (englisch):
A key question regarding the unconventional superconductivityof Sr2RuO4remains whether the order parameter is single- ortwo-component. Under a hypothesis of two-component super-conductivity, uniaxial pressure is expected to lift their degeneracy,resulting in a split transition. The most direct and fundamentalprobe of a split transition is heat capacity. Here, we report mea-surement of heat capacity of samples subject to large and highlyhomogeneous uniaxial pressure. We place an upper limit on theheat-capacity signature of any second transition of a few percentof that of the primary superconducting transition. The normalizedjump in heat capacity,∆C/C, grows smoothly as a function ofuniaxial pressure, favoring order parameters which are allowedto maximize in the same part of the Brillouin zone as the well-studied van Hove singularity. Thanks to the high precision ofour measurements, these findings place stringent constraints ontheories of the superconductivity of Sr2RuO4

DOI: 10.1073/pnas.2020492118
Zitationen: 11
Zitationen: 15
Zugehörige Institution(en) am KIT Institut für Quantenmaterialien und -technologien (IQMT)
Institut für Theorie der Kondensierten Materie (TKM)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 03.2021
Sprache Englisch
Identifikator ISSN: 0027-8424, 1091-6490
KITopen-ID: 1000130560
HGF-Programm 47.11.02 (POF IV, LK 01) Emergent Quantum Phenomena
Weitere HGF-Programme 43.21.01 (POF III, LK 01) Quantum Correlations in Condensed Matter
Erschienen in Proceedings of the National Academy of Sciences of the United States of America
Verlag National Academy of Sciences
Band 118
Heft 10
Seiten Article: e2020492118
Vorab online veröffentlicht am 02.03.2021
Nachgewiesen in Scopus
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