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Emergence of superconductivity in several transition metal chalcogenides

ORAL

Abstract

Superconducting (SC) and charge-density-wave (CDW) states are pair condensates of electrons and of electrons and holes, respectively. In many quantum materials, these two states are found to coexist or compete. Transition-metal chalcogenides such as TaSe2−xSx [1] and ZrTe3−xSex [2] exhibit both SC and CDW phases and may be viewed as model systems to study the interplay between these two types of order. In both systems, substitutional disorder enhances SC order and suppresses CDW order [1,2]. We use AC nonlinear magnetic response, a probe that was recently shown to be highly sensitive to SC fluctuations [3], to correlate the diamagnetic response above the superconducting transition temperature with the substitutional disorder. Our results indicate rather narrow SC fluctuation regimes, yet with unconventional temperature dependences of the diamagnetic signal. We discuss these findings in the context of recent work on oxide superconductors [3].

[1] L. Li et al., npj Quant. Mater. 2, 11 (2017)
[2] X. Zhu et al., Sci. Rep. 6, 26974 (2016)
[3] D. Pelc et al., Nat. Commun. 10, 2729 (2019)

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Presenters

  • Chiou Yang Tan

    School of Physics and Astronomy, University of Minnesota

Authors

  • Chiou Yang Tan

    School of Physics and Astronomy, University of Minnesota

  • Nikolaos Biniskos

    School of Physics and Astronomy, University of Minnesota, Forschungszentrum Juelich

  • Sajna Hameed

    School of Physics and Astronomy, University of Minnesota, University of Minnesota, School of Physics & Astronomy, University of Minnesota

  • Damjan Pelc

    School of Physics and Astronomy, University of Minnesota, University of Minnesota, University of Zagreb, Department of Physics, University of Zagreb, Faculty of Science

  • Yuan Li

    International Center for Quantum Materials, School of Physics, Peking University, Peking University, Peking Univ, International Cent re for Quantum Materials, School of Physics, Peking University, Beijing, Peking Univ

  • Xiangde Zhu

    High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei

  • Cedomir Petrovic

    Brookhaven National Laboratory, Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, CMPMS Department, Brookhaven National Laboratory

  • Martin Greven

    School of Physics and Astronomy, University of Minnesota, University of Minnesota, School of Physics & Astronomy, University of Minnesota