SELF-CONSISTENT LARGE-N EXPANSION FOR NORMAL-STATE PROPERTIES OF DILUTE MAGNETIC-ALLOYS
SELF-CONSISTENT LARGE-N EXPANSION FOR NORMAL-STATE PROPERTIES OF DILUTE MAGNETIC-ALLOYS
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DOI：
10.1103/physrevb.36.2036
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发表时间：
1987-08-01
影响因子：
3.7
通讯作者：
WILKINS, JW
中科院分区：
文献类型：
--
作者：
BICKERS, NE;COX, DL;WILKINS, JW
用统一的方法计算了稀土合金无限U安德森模型的高温性质。杂质电子态密度和磁矩谱为描述静态和动态性质提供了一个自然的框架。态密度和矩谱表现出低能量的“近藤共振”与近似的单参数标度，持续的杂质价在1.0-0.7的范围内。共振在零温度态密度T0中的位置决定了所有低温性质的尺度。杂质价态，电阻率，热电势，热导率，磁化率，比热，光电子和逆光电子谱，和中子散射线宽的结果报告。自旋-轨道相互作用的影响被纳入理论。计算是一个图形近似的简化概念的大角动量简并度（N）的动机。近似解是相容的，并且满足所有相关的求和规则。静态性质（磁化率和比热）与Bethe的精确结果吻合得很好。稀铈合金和浓铈合金的实验结果定量描述与使用一个参数（T0）理论。
Finite-temperature properties of the infinite-U Anderson model for rare-earth alloys are calculated within a unified approach. The impurity-electron density of states and magnetic moment spectrum provide a natural framework for describing both static and dynamic properties. The density of states and moment spectrum exhibit low-energy" Kondo resonances" with approximate single-parameter scaling, which persists for impurity valences in the range 1.0-0.7. The position of the resonance in the zero-temperature density of states, T 0, sets the scale for all low-temperature properties. Results are reported for the impurity valence, resistivity, thermopower, thermal conductivity, magnetic susceptibility, specific heat, photoemission and inverse-photoemission spectra, and neutron scattering linewidth. The effect of spin-orbit interactions is incorporated in the theory. The calculation is a diagrammatic approximation motivated by the simplifying concept of large angular momentum degeneracy (N). The approximate solution is thermodynamically consistent and satisfies all pertinent sum rules. Static properties (magnetic susceptibility and specific heat) are in good agreement with exact results of the Bethe ansatz. Experimental results on both dilute and concentrated Ce alloys are described quantitatively with use of a one-parameter (T 0) theory.