Spontaneously orbital-selective superconductivity in a three-orbital Hubbard model

Abstract

We study a three-orbital Hubbard model with negative Hund coupling in infinite dimensions, combining dynamical mean-field theory with continuous time quantum Monte Carlo simulations. This model, which is relevant for the description of alkali-doped fullerides, has previously been shown to exhibit a spontaneous orbital selective Mott phase in the vicinity of the superconducting phase. Calculating the pair potential and double occupancy in each orbital, we study the competition between different homogeneous ordered states and determine the corresponding finite temperature phase diagram of the model. We identify two distinct types of spontaneous orbital-selective Mott states and show that an orbital-selective $s$-wave superconducting state with one superconducting and two metallic orbitals is spontaneously realized between the conventional $s$-wave superconducting phase and these two kinds of spontaneously orbital-selective Mott states.

arXiv comment5pages, 4figures

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• Tuning the electronic states and superconductivity in alkali fulleride films
• Entropy and electronic orders of the three-orbital Hubbard model with antiferromagnetic Hund coupling
• Unconventional orbital ordering and emergent dimensional reduction in fulleride superconductors
• Eliashberg theory of the Jahn-Teller-Hubbard model
• Entropy and specific heat of the infinite-dimensional three-orbital Hubbard model
• Spin-orbital model for fullerides
• Itinerant ferromagnetism in an SU(3) Fermi-Hubbard model at finite temperatures: A dynamical mean-field theory study
• Symmetry breaking states in the half-filled two-orbital Hubbard model with crystalline electric field
• Holographic Aspects of Dynamical Mean-Field Theory
• Real-space orbital tiling approach for the design of novel superconductors
• Generalized Nagaoka ferromagnetism accompanied by flavor-selective Mott states in an SU($N$) Fermi-Hubbard model