The effect of local magnetic moments on spectral properties and resistivity near the interaction- and doping induced Mott transitions

Abstract

We study the effect of the formation and screening of local magnetic moments on the temperature- and interaction dependencies of spectral functions and resistivity in the vicinity of the metal-insulator transition. We use the dynamical mean-field theory for the strongly correlated Hubbard model and associate the peculiarities of the above mentioned properties with those found for the local charge ${\chi }_c$ and spin ${\chi }_s$ susceptibilities. We show that at half filling the maximum of resistivity at a certain temperature $T^{\ast }$ corresponds to the appearance of central quasiparticle peak of the spectral function and entering the metallic regime with well defined fermionic quasiparticles. At the same time, the temperature of the crossover to the regime with screening of local magnetic moments, determined by the minimum of double occupation, is smaller than the temperature scale $T^{\ast }$ and coincides at half filling with the boundary $T_{\beta =1}(U)$ corresponding to the exponent of resistivity $\beta \equiv d\ln \rho /d\ln T=1$. Away from half filling we find weak increase of the temperature of the beginning and completion of the screening (i.e. Kondo temperature) of local magnetic moments, while the unscreened local magnetic moments exist only up to few percents of doping. In the low temperature regime $T<T_{\beta =1}$ simultaneous presence of itinerant and localized degrees of freedom yields almost linear temperature dependence of scattering rate and resistivity.

10 pages, 12 figures

References in corpus (14)

• Mott Transition from a Spin Liquid to a Fermi Liquid in the Spin-Frustrated Organic Conductor kappa-(ET)2Cu2(CN)3
• Energy resolution and discretization artefacts in the numerical renormalization group
• Enhanced Crystal Field Splitting and Orbital Selective Coherence by Strong Correlations in V_2O_3
• Bad-metal behavior reveals Mott quantum criticality in doped Hubbard models
• Mott-Hubbard transition in V2O3 revisited
• Fingerprints of the local moment formation and its Kondo screening in the generalized susceptibilities of many-electron problems
• $i$QIST: An open source continuous-time quantum Monte Carlo impurity solver toolkit
• Rise and Fall of Landau's Quasiparticles While Approaching the Mott Transition
• Charge transport in the Hubbard model at high temperatures: triangular versus square lattice
• 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
• Local magnetic moment formation and Kondo screening in the half filled two dimensional single band Hubbard model
• Transition of a prestine Mott insulator to a correlated Fermi liquid: Pressure-dependent optical investigations of a quantum spin liquid
• Dynamic charge Kondo effect and a slave fermion approach to the Mott transition

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