Small Energy Scale for Mixed-Valent Uranium Materials
Small Energy Scale for Mixed-Valent Uranium Materials
复制标题
混合价铀材料的小能量规模
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
D. Cox
中科院分区：
文献类型：
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作者：
M. Koga;D. Cox
我们研究了一个具有5f{sup 1}磁性和5f{sup 2}四极接地重态和5f{sup 2}激发三重态的双通道Anderson杂质模型。利用数值重整化群方法，我们发现在温度T{sup *}以下的非费米-液态的交叉随着5f{sup *}三重重态分裂的7/2次方而变化。在数值精度范围内，非线性磁化率和5f{sup 1}对线性磁化率的贡献由通用单参数标度函数给出。这些结果可以解释UBe{sub 13}是具有小交叉尺度T{sup *}的混合价。{版权所有}{ital 1999} {ital美国物理学会}
We investigate a two-channel Anderson impurity model with a 5f{sup 1} magnetic and a 5f{sup 2} quadrupolar ground doublet and a 5f{sup 2} excited triplet. Using the numerical renormalization group method, we find a crossover to a non-Fermi-liquid state below a temperature T{sup *} varying as the 5f{sup 2} triplet-doublet splitting to the 7/2 power. To within numerical accuracy, the nonlinear magnetic susceptibility and the 5f{sup 1} contribution to the linear susceptibility are given by universal one-parameter scaling functions. These results may explain UBe{sub 13} as mixed valent with a small crossover scale T{sup *} . {copyright} {ital 1999} {ital The American Physical Society}