KONDO INSULATORS MODELED BY THE ONE-DIMENSIONAL ANDERSON LATTICE - A MUMERICAL-RENORMALIZATION-GROUP STUDY

被引：41

作者：

GUERRERO, M

YU, CC

机构：

[1] Department of Physics and Astronomy, University of California, Irvine

来源：

PHYSICAL REVIEW B | 1995年 / 51卷 / 16期

关键词：

D O I：

10.1103/PhysRevB.51.10301

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In order to better understand Kondo insulators, we have studied both the symmetric and asymmetric Anderson lattices at half filling in one dimension using the density-matrix formulation of the numerical renormalization group. The asymmetric case is treated in the mixed-valence regime. We have calculated the charge gap, the spin gap, and the quasiparticle gap as a function of the repulsive interaction U using open boundary conditions for lattices as large as 24 sites. We find that the charge gap is larger than the spin gap for all U for both the symmetric and asymmetric cases. Ruderman-Kittel-Kasuya-Yosida interactions are evident in the f-spin-f-spin correlation functions at large U in the symmetric case, but are suppressed in the asymmetric case as the f level approaches the Fermi energy. This suppression can also be seen in the staggered susceptibility χ(q=2kF) and it is consistent with neutron scattering measurements of χ(q) in CeNiSn. © 1995 The American Physical Society.

引用

页码：10301 / 10312

页数：12

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