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

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

doi:10.1073/pnas.2020492118

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

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

^*Corresponding author for this work

Physics and Astronomy

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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, 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
.

Original language	English
Article number	e2020492118
Number of pages	6
Journal	Proceedings of the National Academy of Sciences
Volume	118
Issue number	10
DOIs	https://doi.org/10.1073/pnas.2020492118
Publication status	Published - 9 Mar 2021

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2103.02295
This is the Accepted Author Manuscript of an article published in Proceedings of the National Academy of Sciences (PNAS); final published version available at https://doi.org/10.1073/pnas.2020492118
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Cite this

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title = "High-sensitivity heat-capacity measurements on Sr2RuO4 under uniaxial pressure",

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, 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.",

author = "You-sheng Li and Naoki Kikugawa and Sokolov, {Dmitry A.} and Fabian Jerzembeck and Gibbs, {Alexandra S.} and Yoshiteru Maeno and Hicks, {Clifford W.} and J{\"o}rg Schmalian and Michael Nicklas and Mackenzie, {Andrew P.}",

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doi = "10.1073/pnas.2020492118",

language = "English",

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T1 - High-sensitivity heat-capacity measurements on Sr2RuO4 under uniaxial pressure

AU - Li, You-sheng

AU - Kikugawa, Naoki

AU - Sokolov, Dmitry A.

AU - Jerzembeck, Fabian

AU - Gibbs, Alexandra S.

AU - Maeno, Yoshiteru

AU - Hicks, Clifford W.

AU - Schmalian, Jörg

AU - Nicklas, Michael

AU - Mackenzie, Andrew P.

PY - 2021/3/9

Y1 - 2021/3/9

N2 - 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.

AB - 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.

U2 - 10.1073/pnas.2020492118

DO - 10.1073/pnas.2020492118

M3 - Article

SN - 1091-6490

VL - 118

JO - Proceedings of the National Academy of Sciences

JF - Proceedings of the National Academy of Sciences

IS - 10

M1 - e2020492118

ER -

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

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