Orbital-Selective Mott Transition out of Band Degeneracy Lifting

2008/08/31 by Luca de' Medici, Luca de’ Medici, S. R. Hassan +2 · 271 citations
Materials Science · Physics and Astronomy · #Condensed matter physics #Coupling (piping) #Degeneracy (biology) #Electron #Hubbard model #Iron-based superconductors research #Kinetic energy #Materials science #Mott transition #Phase transition #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Rare-earth and actinide compounds #Superconductivity #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevlett.102.126401

published in Physical Review Letters 102(12), 126401 (American Physical Society) · Published version

openalex publication_date 2009/03/23 · arxiv created 2009/03/24 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We outline a general mechanism for orbital-selective Mott transition, the coexistence of both itinerant and localized conduction electrons, and show how it can take place in a wide range of realistic situations, even for bands of identical width and correlation, provided a crystal field splits the energy levels in manifolds with different degeneracies and the exchange coupling is large enough to reduce orbital fluctuations. The mechanism relies on the different kinetic energy in manifolds with different degeneracy. This phase has Curie-Weiss susceptibility and non-Fermi-liquid behavior, which disappear at a critical doping, all of which is reminiscent of the physics of the pnictides.

Citations

• Dynamical behavior across the Mott transition of two bands with different bandwidths
• Orbital state and magnetic properties ofLiV2O4
• Orbital-Selective Mott Transitions in the Degenerate Hubbard Model
• Theory of the Magnetic Moment in Iron Pnictides
• Strongly Correlated Superconductivity
• Orbital-selective Mott transition in multiband systems: Slave-spin representation and dynamical mean-field theory
• High-Spin to Low-Spin and Orbital Polarization Transitions in Multiorbital Mott Systems

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• Local spin fluctuations in iron-based superconductors:Se<mml:mprescripts/><mml:none/>77andRb<mml:mprescripts/><mml:none/>87NMR measurements on Tl0.47Rb0.34Fe1.63Se2
• J Freezing and Hund’s Rules in Spin-Orbit-Coupled Multiorbital Hubbard Models
• Interplay between spin-orbit coupling and Van Hove singularity in the Hund's metallicity of Sr2RuO4
• Spontaneously orbital-selective superconductivity in a three-orbital Hubbard model
• Orbitally selective breakdown of the Fermi liquid and simultaneous enhancement of metallic and insulating states in correlated multiband systems with spin-orbit coupling
• Optical study of the antiferromagnetic ordered state in electron-overdopedCa0.77Nd0.23FeAs2
• Observation of universal strong orbital-dependent correlation effects in iron chalcogenides
• Effect of the iron valence in the two types of layers inLiFeO2Fe2Se2
• Microscopic description of localization-delocalization transitions in BaFe2S3
• Local Spin Excitations Mediate Quasiparticle Breakdown in the Orbital-Selective Mott Phase
• Symmetry-mixed bound-state order
• Hund Physics Landscape of Two-Orbital Systems

Related

• T=0Heavy-Fermion Quantum Critical Point as an Orbital-Selective Mott Transition
• Doping-driven orbital-selective Mott transition in multi-band Hubbard models with crystal field splitting
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• The Orbital Selective Mott Transition in a Three Band Hubbard model: a Slave Boson Mean Field Study
• Power-Law Spectra and Asymptotic ω/T Scaling in the Orbital-Selective Mott Phase of a Three-Orbital Hubbard Model