Self-consistent perturbation theory for dynamics of valence fluctuations
Self-consistent perturbation theory for dynamics of valence fluctuations
复制标题
价态波动动力学的自洽微扰理论
DOI：
10.1007/bf02071959
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发表时间：
1984
期刊：
影响因子：
--
通讯作者：
H. Kojima
中科院分区：
文献类型：
--
作者：
Y. Kuramoto;H. Kojima
研究了绝对零度下价涨落体系的动力学性质。自洽微扰理论发展的稀土杂质系统的使用与一些改进。该理论考虑了4f和传导电子杂化引起的正交突变。对4f电子态密度ε 4f（ω）和动态磁化率χ（ω）进行了大量的数值计算.结果涵盖了模型Ce杂质系统的中间价态和近整价态。该理论给出了合理的动力学总体特征，包括在近藤区出现了一个尖峰。然而，动力学量的低频极限与费米液体性质并不一致。结果表明，本结果和费米液体理论的结果的插值是可能的。因此，在宽的激励频率范围内获得准确的动态信息。
Dynamical properties of valence-fluctuating systems are studied at absolute zero of temperature. The self-consistent perturbation theory developed for rare-earth impurity systems is used with some refinement. The theory takes account of the orthogonality catastrophe caused by hybridization of 4fand conduction electrons. Extensive numerical results are reported for the 4f-electron density of states ϱ4f(ɛ) and the dynamical magnetic susceptibility χ(ω). The results cover both the intermediate-valence and nearly integral-valence regimes of a model Ce impurity system. The present theory gives reasonable overall feature of dynamics including a sharp peak in ϱ4f(ɛ∼0) in the Kondo regime. However, the low-frequency limit of dynamical quantities is not consistent with the Fermi-liquid property. It is shown that interpolation of the present results and those by the Fermi-liquid theory is possible. Hence accurate dynamical information is obtained over a wide excitation-frequency range.