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Random Kondo alloys investigated with the coherent potential approximation

机译:用相干势近似研究随机Kondo合金

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摘要

The interplay between the Kondo effect and disorder is studied. This is done by applying a matrix coherent potential approximation and treating the Kondo interaction on a mean-field level. The resulting equations are shown to agree with those derived by the dynamical mean-field theory. By applying the formalism to a Bethe tree structure with infinite coordination, the effects of diagonal and off-diagonal disorder are studied. Special attention is paid to the behavior of the Kondo and the Fermi-liquid temperature as function of disorder and concentration of the Kondo ions. The nonmonotonous dependence of these quantities is discussed.
机译:研究了近藤效应与无序之间的相互作用。这是通过应用矩阵相干势近似并在平均场水平上处理近藤相互作用来完成的。结果表明,这些方程与动力学平均场理论推导的方程一致。通过将形式主义应用于无限协调的Bethe树结构,研究了对角线和非对角线无序的影响。特别注意近藤的行为和费米-液温随近藤离子的无序和浓度的变化。讨论了这些数量的非单调依赖性。

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