Hund's induced Fermi-liquid instabilities and enhanced quasiparticle interactions

Abstract

Hund's coupling is shown to generally favor, in a doped half-filled Mott insulator, an increase in the compressibility culminating in a Fermi-liquid instability towards phase separation. The largest effect is found about the frontier between an ordinary and an orbitally-decoupled ("Hund's") metal. The increased compressibility implies an enhancement of quasiparticle scattering, thus favoring other possible symmetry breakings. This physics is shown to happen in simulations of the 122 Fe-based superconductors, possibly implying the relevance of this mechanism in the enhancement of the the critical temperature for superconductivity.

References in corpus (13)

• Strong electronic correlations from Hund's coupling
• High Temperature Superconductivity in Iron Pnictides and Chalcogenides
• Spin freezing transition and non-Fermi-liquid self-energy in a 3-orbital model
• Orbital-Selective Mott transition out of band degeneracy lifting
• Theoretical evidence for strong correlations and incoherent metallic state in FeSe
• Orbital selective Mott transition in multi-band systems: slave-spin representation and dynamical mean-field theory
• Hund's coupling key role in multi-orbital correlations
• Rotationally-invariant slave-boson formalism and momentum dependence of the quasiparticle weight
• U(1) Slave-spin theory and its application to Mott transition in a multi-orbital model for iron pnictides
• Metal-Insulator phase diagram and orbital selectivity in 3-orbital models with rotationally invariant Hund coupling
• Strong Correlations, Strong Coupling and s-wave Superconductivity in Hole-doped BaFe2As2 Single Crystals
• Superconductivity and its mechanism in an ab initio model for electron-doped LaFeAsO
• Coulomb correlation effects in LaOFeAs: LDA+DMFT(QMC) study

Cited by in corpus (37)

• Attractive effect of a strong electronic repulsion -- the physics of vertex divergences
• Charge disproportionation, mixed valence, and Janus effect in multiorbital systems: A tale of two insulators
• The Bethe-Salpeter equation at the critical end-point of the Mott transition
• Chromium analogues of Iron-based superconductors
• Two-particle Fermi liquid parameters at the Mott transition: Vertex divergences, Landau parameters, and incoherent response in dynamical mean-field theory
• Hund-enhanced electronic compressibility in FeSe and its correlation with T${}_c$
• Frustrated spin order and stripe fluctuations in FeSe
• $\mathrm{F}{\mathrm{e}}_3\mathrm{GeT}{\mathrm{e}}_2$: A site-differentiated Hund metal
• Metal-insulator transitions, superconductivity, and magnetism in the two-band Hubbard model
• Hund physics landscape of two-orbital system
• Mott Quantum Critical Points at finite doping
• Antiferromagnetic Skyrmions and Skyrmion Density Wave in Rashba Hund's Insulator
• Extended regime of coexisting metallic and insulating phases in a two-orbital electronic system
• Heavy-fermions in frustrated Hund's metal with portions of incipient flat-bands
• Hund's metal crossover and superconductivity in the 111 family of iron-based superconductors
• Enhancement of charge instabilities in Hund's metals by the breaking of rotational symmetry
• Switching between Mott-Hubbard and Hund physics in moiré quantum simulators
• Nonlocal Coulomb interaction and spin-freezing crossover as a route to valence-skipping charge order
• Correlation strength, orbital-selective incoherence, and local moments formation in the magnetic MAX-phase Mn${}_2$GaC
• Metal-insulator transition and local-moment collapse in negative charge-transfer CaFeO${}_3$ under pressure
• Low quasiparticle coherence temperature in the one band-Hubbard model: A slave-boson approach
• Orbital-dependent correlations in PuCoGa${}_5$
• Nature of the Doping-Driven Metal-Insulator Transition in Correlated Electron Systems with strong Hund's Exchange Coupling
• Hubbard-Kanamori model: spectral functions, negative electron compressibility, and susceptibilities
• Orbital-selective bad metals due to Hund's rule and orbital anisotropy: a finite-temperature slave-spin treatment of the two-band Hubbard model
• Mass enhancements and band shifts in strongly hole overdoped Fe-based pnictide superconductors: KFe${}_2$As${}_2$ and CsFe${}_2$As${}_2$
• Effective enhancement of the electron-phonon coupling driven by nonperturbative electronic density fluctuations
• Charge self-consistent density functional theory plus ghost rotationally-invariant slave-boson theory for correlated materials
• Multi-orbital two-particle self-consistent approach -- strengths and limitations
• Rationalizing doping and electronic correlations in LaFe${}_2$As${}_2$
• Intertwined superconductivity and orbital selectivity in a three-orbital Hubbard model for the iron pnictides
• Disorder correction to the Néel temperature of ruthenium-doped BaFe${}_2$As${}_2$: Theoretical analysis
• Magnetically-induced local lattice anomalies and low-frequency nematic fluctuations in the Mott insulator La${}_2$O${}_3$Fe${}_2$Se${}_2$
• Mott transition, magnetic and orbital orders in the ground state of the two-band Hubbard model using variational slave-spin mean field formalism
• Thermoelectric effect on diffusion in the two-dimensional Hubbard model
• Bad metal and negative compressibility transitions in a two-band Hubbard model
• Efficient slave-boson approach for multiorbital two-particle response functions and superconductivity