Local magnetic moment formation and Kondo screening in the presence of Hund exchange: the two-band Hubbard model analysis

Abstract

We study formation and screening of local magnetic moments in the two-band Hubbard model in the presence of Hund exchange interaction using dynamic mean field theory approach. The characteristic temperatures of the formation, beginning and full screening of local magnetic moments are obtained from the analysis of temperature dependencies of the orbital, charge, and spin susceptibilities, as well as the respective instantaneous correlation functions. At half filling we find the phase diagram, which is similar to the single-orbital case with wide region of formation of local magnetic moments below the orbital Kondo temperature. Similarly to the single-orbital case, with decreasing temperature the screening of local magnetic moments is preceded by appearance of fermionic quasiparticles. In the two-band case the quasiparticles are however present also in some temperature region above the Mott insulating phase. At finite doping we find broad regime of presence of local magnetic moments, which coexist with incoherently or coherently moving holes. We also find, similarly to the half filled case, finite temperature interval in the doped regime, when the fermionic quasiparticles are formed, but do not yet screen local magnetic moments.

arXiv comment12 pages, 14+1 figures

References in corpus (47)

• Continuous-time Monte Carlo methods for quantum impurity models
• A continuous-time solver for quantum impurity models
• Strong electronic correlations from Hund's coupling
• Kinetic frustration and the nature of the magnetic and paramagnetic states in iron pnictides and iron chalcogenides
• Hybridization expansion impurity solver: General formulation and application to Kondo lattice and two-orbital models
• Janus-faced influence of the Hund's rule coupling in strongly correlated materials
• Spin freezing transition and non-Fermi-liquid self-energy in a 3-orbital model
• The coherence-incoherence crossover and the mass-renormalization puzzles in Sr2RuO4
• Hund's coupling key role in multi-orbital correlations
• Nickelate superconductors $--$ Multiorbital nature and spin freezing
• Pseudogap opening and formation of Fermi arcs as an orbital-selective Mott transition in momentum space
• DMFT+NRG study of spin-orbital separation in a three-band Hund's metal
• Local magnetic moments in iron and nickel at ambient and Earth's core conditions
• Hund's coupling and the metal-insulator transition in the two-band Hubbard model
• Magnetic and Dynamic Properties of the Hubbard Model in Infinite Dimensions
• Improved Estimators for the Self-Energy and Vertex Function in Hybridization Expansion Continuous-Time Quantum Monte Carlo Simulations
• Superconductivity from emerging magnetic moments
• Electronic correlations in Hund metals
• Orbital selective local moment formation in iron: first principle route to an effective model
• Thermopower and Entropy: lessons from Sr${}_2$RuO${}_4$
• Hundness versus Mottness in a three-band Hubbard-Hund model: On the origin of strong correlations in Hund metals
• Divergences of the irreducible vertex functions in correlated metallic systems: Insights from the Anderson Impurity Model
• $i$QIST: An open source continuous-time quantum Monte Carlo impurity solver toolkit
• Fingerprints of the local moment formation and its Kondo screening in the generalized susceptibilities of many-electron problems
• Signatures of Mottness and Hundness in archetypal correlated metals
• Self-energy and vertex functions from hybridization expansion continuous-time quantum Monte Carlo for impurity models with retarded interaction
• Magnetic fluctuations and effective magnetic moments in γ-iron due to electronic structure peculiarities
• A spin-freezing perspective on cuprates
• Spin dynamics of itinerant electrons: local magnetic moment formation and Berry phase
• $i$QIST v0.7: An open source continuous-time quantum Monte Carlo impurity solver toolkit
• Long-range orders, spin- and orbital-freezing in the two-band Hubbard model
• Momentum-dependent susceptibilities and magnetic exchange in bcc iron from supercell DMFT calculations
• Differentiating Hund from Mott physics in a three-band Hubbard-Hund model: Temperature dependence of spectral, transport, and thermodynamic properties
• Non-perturbative intertwining between spin and charge correlations: A "smoking gun" single-boson-exchange result
• Local magnetic moment formation and Kondo screening in the half filled two dimensional single band Hubbard model
• Hund physics landscape of two-orbital system
• Mott Quantum Critical Points at finite doping
• Uncovering Non-Fermi-Liquid Behavior in Hund Metals: Conformal Field Theory Analysis of an SU(2)$\times$SU(3) Spin-Orbital Kondo Model
• Extracting Kondo temperature of strongly-correlated systems from the inverse local magnetic susceptibility
• Hund's metal crossover and superconductivity in the 111 family of iron-based superconductors
• Transition from Pauli paramagnetism to Curie-Weiss behaviour in vanadium
• The effect of local magnetic moments on spectral properties and resistivity near the interaction- and doping induced Mott transitions
• Nature of the Doping-Driven Metal-Insulator Transition in Correlated Electron Systems with strong Hund's Exchange Coupling
• Spin freezing and the Sachdev-Ye model
• Electronic correlation effects and local magnetic moments in L1${}_0$ phase of FeNi
• Reply to: "Extracting Kondo temperature of strongly-correlated systems from the inverse local magnetic susceptibility"
• Frozen spin ratio and the detection of Hund correlations