Orbitally selective breakdown of the Fermi liquid and simultaneous enhancement of metallic and insulating states in correlated multiband systems with spin-orbit coupling

2020/12/16 by Ze-Yi Song, Xiu-Cai Jiang, Yu-Zhong Zhang +1
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Atomic orbital #Condensed matter physics #Coulomb #Coupling (piping) #Electron #Fermi level #Fermi liquid theory #Hubbard model #Magnetic and transport properties of perovskites and related materials #Materials science #Metal #Mott insulator #Mott transition #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Spin–orbit interaction #Superconductivity #cond-mat.str-el

paper · pdf · doi:10.1103/physrevb.102.245124

published as Phys. Rev. B 102, 245124 (2020) · 12 pages, 8 figures

openalex publication_date 2020/12/16 · openalex created_date 2020/12/21 · arxiv created 2021/07/01 · arxiv updated 2021/07/02 · openalex updated_date 2026/08/05

Abstract

We show that spin-orbit coupling (SOC) plays Janus-faced roles on the orbitally selective Mott transitions in a three-orbital Hubbard model with crystal field splitting at a specific filling of 2/3, which is a minimal Hamiltonian for ruthenates. While the SOC favors the metallic state due to enhancement of orbital hybridization at smaller on-site Coulomb repulsions, it stabilizes the Mott-insulating state ascribed to the lifting of orbital degeneracies and enhancement of band polarizations at larger electronic interaction. Moreover, an orbitally selective non-Fermi liquid (OSNFL), where breakdown and retention of the Fermi liquid coexist in different orbitals, emerges between the orbitally selective Mott phase and the Fermi-liquid state. This novel state can be used to account for the exotic metallic behavior observed in 4d materials, such as Ca_1.8Sr_0.2RuO₄, Ba₂RuO₄ under strain, and Sr₂RuO₄ under uniaxial pressure. We propose that orbitally selective Kondo breakdown may account for the OSNFL.

Citations

• Observation of a Novel Orbital Selective Mott Transition inCa1.8Sr0.2RuO4
• Orbital-Selective Mott Transitions in the Degenerate Hubbard Model
• Cluster Dynamical Mean Field Theory of the Mott Transition
• Orbital-Selective Mott Transition out of Band Degeneracy Lifting
• Pseudogap and Mott transition studied by cellular dynamical mean-field theory
• High-Spin to Low-Spin and Orbital Polarization Transitions in Multiorbital Mott Systems
• Magnetism and charge dynamics in iron pnictides
• Quantum spin liquid states
• J Freezing and Hund’s Rules in Spin-Orbit-Coupled Multiorbital Hubbard Models

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