稀土和锕系化合物中重费密子行为

本文采用周期Anderson哈密顿量研究了稀土和锕系化合物中的重费密子行为。对f电子间库仑关联项做了平均场近似并引入自能项反映多体作用的效应。对自能项采用了单格位近似,在准粒子表象中讨论了系统的性质,通过对f电子平均占据数的自洽计算,得到了准粒子有效质量,讨论了形成重费密子的条件,以及相应的磁性的变化,并做了数值计算。所得结果与最近的实验进行了比较。 关键词：

THE HEAVY-FERMION BEHAVIOR IN THE RARE-EARTH AND ACTINIDE COMPOUNDS

In this paper, the periodic Anderson Hamiltonian has been used to study the heavy-fermion behavior in the Rare-Earth and Actinide compounds. The mean-field approximation has been applied to the Coulomb correlation term between the f electrons and a self-energy term has been introduced to represent the effect of the many-body interaction. The single-site approximation has been used for the self-energy term. The properties of the systems have been discussed in a quasi-particle picture. The effective mass of the quasi-particles has been obtained through the self-consistent calculation of the average occupation number of the f electrons. The conditions necessary for the presence of the heavy fermions and the corresponding change of the magnetic properties have been discussed and numerical computation has been carried out. The calculated results have been compared with recent experiments.