TY - JOUR

T1 - Path to poor coherence in the periodic Anderson model from Mott physics and hybridization

AU - Amaricci, A.

AU - Medici, L. De'

AU - Sordi, G.

AU - Rozenberg, M. J.

AU - Capone, M.

PY - 2012/6/5

Y1 - 2012/6/5

N2 - We investigate the anomalous metal arising from hole-doping the Mott insulating state in the periodic Anderson model. Using dynamical mean-field theory we show that, as opposed to the electron-doped case, in the hole-doped regime the hybridization between localized and delocalized orbitals leads to the formation of composite quasiparticles reminiscent of the Zhang-Rice singlets. We compute the coherence temperature of this state, showing its extremely small value at low doping. As a consequence the weakly doped Mott state deviates from the predictions of Fermi-liquid theory already at small temperatures. The onset of the Zhang-Rice state and of the consequent poor coherence is due to the electronic structure in which both localized and itinerant carriers have to be involved in the formation of the conduction states and to the proximity to the Mott state. By investigating the magnetic properties of this state, we discuss the relation between the anomalous metallic properties and the behavior of the magnetic degrees of freedom.

AB - We investigate the anomalous metal arising from hole-doping the Mott insulating state in the periodic Anderson model. Using dynamical mean-field theory we show that, as opposed to the electron-doped case, in the hole-doped regime the hybridization between localized and delocalized orbitals leads to the formation of composite quasiparticles reminiscent of the Zhang-Rice singlets. We compute the coherence temperature of this state, showing its extremely small value at low doping. As a consequence the weakly doped Mott state deviates from the predictions of Fermi-liquid theory already at small temperatures. The onset of the Zhang-Rice state and of the consequent poor coherence is due to the electronic structure in which both localized and itinerant carriers have to be involved in the formation of the conduction states and to the proximity to the Mott state. By investigating the magnetic properties of this state, we discuss the relation between the anomalous metallic properties and the behavior of the magnetic degrees of freedom.

KW - MAGNETISM

KW - SUPERCONDUCTIVITY

KW - DOUBLE EXCHANGE

KW - STATE

KW - SCALE

KW - INFINITE DIMENSIONS

KW - HEAVY-FERMION SYSTEMS

KW - MEAN-FIELD THEORY

KW - MONTE-CARLO SIMULATIONS

KW - KONDO-LATTICE

U2 - 10.1103/PhysRevB.85.235110

DO - 10.1103/PhysRevB.85.235110

M3 - Article

VL - 85

JO - Physical Review B

JF - Physical Review B

SN - 1098-0121

IS - 23

M1 - ARTN 235110

ER -