Upper critical field of Sr<sub>2</sub>RuO<sub>4</sub> under uniaxial stress

ORAL

Abstract

Through application of in-plane uniaxial stress, the unconventional superconductor Sr2RuO4 can be driven through a Lifshitz transition and associated Van Hove singularity (VHS) in the density of states. At this point, its Tc is enhanced by a factor of about 2.5, and Hc2 by about twenty. Here, we present data on Hc2 at intermediate strains, and observe that the peak in Hc2 is much sharper than that in Tc. The ratio Hc2/Tc2 increases in the close vicinity to the VHS, providing information on the evolution of the superconducting gap as the VHS is approached.

[1] C.W. Hicks et al. Science 344.6181 (2014): 283-285.
[2] A. Steppke et al., Science 355, eaaf9398 (2017)

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Presenters

  • Fabian Jerzembeck

    • Max-Planck-Institut for Chemical Physics of Solids

Authors

  • Fabian Jerzembeck

    • Max-Planck-Institut for Chemical Physics of Solids

  • Alexander Steppke

    • Max-Planck-Institut for Chemical Physics of Solids
    • Max Planck Institute for Chemical Physics of Solids

  • YOU-SHENG LI

    • Max Planck Institute for Chemical Physics of Solids
    • Max-Planck-Institut for Chemical Physics of Solids

  • Dmitry Sokolov

    • Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
    • Max-Planck-Institut for Chemical Physics of Solids
    • Max Planck Institute for Chemical Physics of Solids

  • Naoki Kikugawa

    • Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
    • National Institute for Material Science, Tsukuba, Ibaraki
    • National Institute for Materials Science, Tsukuba
    • National Institute for Materials Science
    • Quantum Transport Properties Group, National Institute for Materials Science (NIMS), Tsukuba 305-0003, Japan
    • National Institute for Material Science

  • Andrew Mackenzie

    • Max-Planck-Institute for Chemical Physics of Solids
    • Max Planck Institute for Chemical Physics of Solids
    • Max Planck Institute for Chemical Physics of Solids, Dresden,Germany
    • Max Planck Institute for Chemical Physics of Solids, Dresden, Germany
    • Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
    • Max-Planck-Institut for Chemical Physics of Solids
    • Physics of Quantum Materials, Max Planck Institute of Chemical Physics of Solids

  • Clifford Hicks

    • Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
    • Max-Planck-Institut for Chemical Physics of Solids
    • Max Planck Institute for Chemical Physics of Solids, Dresden, Germany