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Li, You-Sheng; Kikugawa, Naoki; Sokolov, Dmitry A; Jerzembeck, Fabian; Gibbs, Alexandra S; Maeno, Yoshiteru; Hicks, Clifford W; Schmalian, Jorg; Nicklas, Michael; Mackenzie, Andrew P
Proceedings of the National Academy of Sciences - PNAS, 03/2021, Letnik: 118, Številka: 10Journal Article
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, ΔC/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.
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in: SICRIS
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