Low-energy scale of the periodic Anderson model | |
Article | |
关键词: NUMERICAL RENORMALIZATION-GROUP; DILUTE MAGNETIC-ALLOYS; TRANSITION-METAL OXIDE; INFINITE DIMENSIONS; HUBBARD-MODEL; TEMPERATURE-DEPENDENCE; KONDO SCALE; LATTICE; PHOTOEMISSION; TRANSPORT; | |
DOI : 10.1103/PhysRevB.61.12799 | |
来源: SCIE |
【 摘 要 】
Wilson's numerical renormalization-group method is used to study the paramagnetic ground state of the periodic Anderson model within the dynamical mean-field approach. For the particle-hole symmetric model, which is a Kondo insulator, we find that the lattice Kondo scale T-O is strongly enhanced over the impurity scale T-K; T-0/T(K)proportional to exp{1/31}, where I is the Schrieffer-Wolff exchange coupling. In the metallic regime, where the conduction-band filling is reduced from one, we find characteristic signatures of Nozieres' exhaustion scenario, including a strongly reduced lattice Kondo scale, a significant suppression of the states available to screen the S-electron moment, and a Kondo resonance with a strongly enhanced height. However, in contrast to the quantitative predictions of Nozieres, we find that the T(0)proportional to T-K with a coefficient that depends strongly on conduction-band filling.
【 授权许可】
Free