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Elastocaloric determination of the phase diagram of Sr2RuO4

Author

Listed:
  • You-Sheng Li

    (Max Planck Institute for Chemical Physics of Solids)

  • Markus Garst

    (Karlsruher Institut für Technologie
    Karlsruher Institut für Technologie)

  • Jörg Schmalian

    (Karlsruher Institut für Technologie
    Karlsruher Institut für Technologie)

  • Sayak Ghosh

    (Cornell University)

  • Naoki Kikugawa

    (National Institute for Materials Science)

  • Dmitry A. Sokolov

    (Max Planck Institute for Chemical Physics of Solids)

  • Clifford W. Hicks

    (Max Planck Institute for Chemical Physics of Solids
    University of Birmingham)

  • Fabian Jerzembeck

    (Max Planck Institute for Chemical Physics of Solids)

  • Matthias S. Ikeda

    (Stanford University
    Stanford University
    SLAC National Accelerator Laboratory)

  • Zhenhai Hu

    (Max Planck Institute for Chemical Physics of Solids)

  • B. J. Ramshaw

    (Cornell University)

  • Andreas W. Rost

    (University of St Andrews
    Max Planck Institute for Solid State Research)

  • Michael Nicklas

    (Max Planck Institute for Chemical Physics of Solids)

  • Andrew P. Mackenzie

    (Max Planck Institute for Chemical Physics of Solids
    University of St Andrews)

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 tuning2,3, leading to experiments that have advanced our understanding of the fascinating unconventional superconductor Sr2RuO4 (refs. 4–9). 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. The phase diagram is intriguing both for its similarity to those seen in other families of unconventional superconductors and for extra features unique, so far, to Sr2RuO4.

Suggested Citation

  • You-Sheng Li & Markus Garst & Jörg Schmalian & Sayak Ghosh & Naoki Kikugawa & Dmitry A. Sokolov & Clifford W. Hicks & Fabian Jerzembeck & Matthias S. Ikeda & Zhenhai Hu & B. J. Ramshaw & Andreas W. Ro, 2022. "Elastocaloric determination of the phase diagram of Sr2RuO4," Nature, Nature, vol. 607(7918), pages 276-280, July.
    • Handle: RePEc:nat:nature:v:607:y:2022:i:7918:d:10.1038_s41586-022-04820-z
    DOI: 10.1038/s41586-022-04820-z
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    Cited by:

    1. Ilya Shipulin & Nadia Stegani & Ilaria Maccari & Kunihiro Kihou & Chul-Ho Lee & Quanxin Hu & Yu Zheng & Fazhi Yang & Yongwei Li & Chi-Ming Yim & Ruben Hühne & Hans-Henning Klauss & Marina Putti & Fede, 2023. "Calorimetric evidence for two phase transitions in Ba1−xKxFe2As2 with fermion pairing and quadrupling states," Nature Communications, Nature, vol. 14(1), pages 1-9, December.

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