Pairing Mechanism in Hunds Metal Superconductors and the Universality of the Superconducting Gap to Critical Temperature Ratio

ORAL

Abstract

We propose a simple spin-fluctuation Eliashberg model that contains the physical ingredients of a Hund's metal, the local spin-fluctuations with super-linear correlators, (Ω0/|Ω|)γ with γ>1, interacting with electrons. Our model yields a universal superconducting gap to critical temperature ratio 2△max/Tc≈7.2 that coincides with the experimental observation in a series of iron-based superconductors. We also discuss the implications of our model in the other classes of superconductors, e.g., cuprates and heavy fermion superconductors.

*T.-H.L. and G.K. were supported by the NSF Grant No. DMR-1733071. A.V.C. was supported by the NSF Grant No. DMR-1523036. H. M. is supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Early Career Award Program under Award No. 1047478.

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Presenters

  • Tsung-Han Lee

    • Physics and Astronomy Department, Rutgers University

Authors

  • Tsung-Han Lee

    • Physics and Astronomy Department, Rutgers University

  • Andrey Chubukov

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

  • Hu Miao

    • Brookhaven National Laboratory

  • Gabriel Kotliar

    • Rutgers University and Brookhaven National Laboratories
    • Department of Condensed Matter Physics and Materials Science, Upton, New York 11973, USA, Brookhaven National Laboratory
    • Rutgers University, New Brunswick
    • Brookhaven National Laboratory
    • Department of Physics, Rutgers University
    • Physics, Rutgers University
    • Rutgers University, New Jersey, USA
    • Physics and Astronomy Department, Rutgers University
    • Department of Physics and Astronomy, Rutgers University, NJ