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.

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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