Van Hove singularity and stress-induced Fermi surface tuning in Sr<sub>2</sub>RuO<sub>4</sub>

ORAL

Abstract

Application of in-plane uniaxial stress to the quasi-2D correlated material Sr2RuO4 results in pronounced changes to the physical properties; most familiar is a factor 2.5 increase in superconducting transition temperature. The normal state of Sr2RuO4 is also impacted. Specifically, the crossover temperature to standard Fermi Liquid properties can be tuned from T=30 K to almost 0 K with -0.44% strain. These anomalous properties are associated with the proximity of the Fermi energy (EF) to a sharp singularity in the density of states, which can be tuned to EF and thus varies strongly on the scale of the Zeeman interaction and thermal energies. Reported here are 17O NMR hyperfine shifts over a wide range of stress, field, and temperature. Simple modeling of the results indicates that the difference between EF and the energy of the van Hove singularity plays a dominant role in the normal state properties for temperatures of order 300 K and below.

*Support from the National Science Foundation (DMR-1709304) and by the Laboratory Directed Research and Development (LDRD) programme of Los Alamos National Laboratory (20170204ER) is acknowledged.

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Presenters

  • Aaron Chronister

    • University of California, Los Angeles

Authors

  • Aaron Chronister

    • University of California, Los Angeles

  • Andrej Pustogow

    • University of California, Los Angeles

  • Yongkang Luo

    • Huazhong University of Science and Technology
    • University of California, Los Angeles
    • Huazhong University of Science & Technology

  • Yue-Shun Su

    • University of California, Los Angeles

  • Andrew Mackenzie

    • Max Planck Institute for Chemical Physics of Solids
    • Max Planck Institut for Chemical Physics of Solids
    • Max Planck Institute for Chemical Physics of Solids, Dresden, Germany
    • MPI CPfS, Dresden, Germany

  • Clifford W Hicks

    • Max Planck Institute for Chemical Physics of Solids

  • Eric Bauer

    • Los Alamos National Laboratory
    • Los Alamos Natl Lab
    • Condensed Matter and Magnet Science Group, Los Alamos National Laboratory
    • Los Alamos National Laboratory, Los Alamos

  • Naoki Kikugawa

    • 5National Institute for Material Science, Japan
    • National Institute for Material Science, Tsukuba Japan
    • National Institute for Material Science, Japan
    • National Institute for Materials Science, Tsukuba, Japan

  • Stuart Brown

    • University of California, Los Angeles