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  High-sensitivity heat-capacity measurements on Sr2RuO4 under uniaxial pressure

Li, Y.-S., Kikugawa, N., Sokolov, D. A., Jerzembeck, F., Gibbs, A. S., Maeno, Y., et al. (2021). High-sensitivity heat-capacity measurements on Sr2RuO4 under uniaxial pressure. Proceedings of the National Academy of Sciences of the United States of America, 118(10): e2020492118, pp. 1-6. doi:10.1073/pnas.2020492118.

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 Creators:
Li, You-Sheng1, Author              
Kikugawa, Naoki2, Author
Sokolov, Dmitry A.1, Author              
Jerzembeck, Fabian1, Author              
Gibbs, Alexandra S.2, Author
Maeno, Yoshiteru2, Author
Hicks, Clifford W.3, Author              
Schmalian, Jörg2, 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: Heat capacity, Superconductivity, Uniaxial pressure, article, heat, superconductivity
 Abstract: A key question regarding the unconventional superconductivity of Sr2RuO4 remains whether the order parameter is single- or two-component. Under a hypothesis of two-component superconductivity, uniaxial pressure is expected to lift their degeneracy, resulting in a split transition. The most direct and fundamental probe of a split transition is heat capacity. Here, we report measurement of heat capacity of samples subject to large and highly homogeneous uniaxial pressure. We place an upper limit on the heat-capacity signature of any second transition of a few percent of that of the primary superconducting transition. The normalized jump in heat capacity, ∆C/C, grows smoothly as a function of uniaxial pressure, favoring order parameters which are allowed to maximize in the same part of the Brillouin zone as the well-studied van Hove singularity. Thanks to the high precision of our measurements, these findings place stringent constraints on theories of the superconductivity of Sr2RuO4 © 2021 National Academy of Sciences. All rights reserved.

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Language(s): eng - English
 Dates: 2021-03-022021-03-02
 Publication Status: Published in print
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 Identifiers: DOI: 10.1073/pnas.2020492118
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Title: Proceedings of the National Academy of Sciences of the United States of America
Source Genre: Journal
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Pages: - Volume / Issue: 118 (10) Sequence Number: e2020492118 Start / End Page: 1 - 6 Identifier: -