2018/06/04 by Kosuke Ishigaki, Joji Nasu, Akihisa Koga +2
Materials Science · Physics and Astronomy · #Condensed matter physics #Hubbard model #Iron-based superconductors research #Magnetic and transport properties of perovskites and related materials #Physics #Physics of Superconductivity and Magnetism #Superconductivity #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.98.235120
published as Phys. Rev. B 98, 235120 (2018) · 5pages, 4figures
arxiv created 2018/06/04 · openalex publication_date 2018/12/10 · arxiv updated 2018/12/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
We study a three-orbital Hubbard model with negative Hund's 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.