Phys. Rev. Lett. 82, 2575–2578 (1999)Small Energy Scale for Mixed-Valent Uranium MaterialsReceived 9 November 1998; published in the issue dated 22 March 1999 We investigate a two-channel Anderson impurity model with a 5f1 magnetic and a 5f2 quadrupolar ground doublet and a 5f2 excited triplet. Using the numerical renormalization group method, we find a crossover to a non-Fermi-liquid state below a temperature T* varying as the 5f2 triplet-doublet splitting to the 7/2 power. To within numerical accuracy, the nonlinear magnetic susceptibility and the 5f1 contribution to the linear susceptibility are given by universal one-parameter scaling functions. These results may explain UBe13 as mixed valent with a small crossover scale T*. © 1999 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.82.2575
DOI:
10.1103/PhysRevLett.82.2575
PACS:
75.20.Hr, 71.10.Hf, 71.27.+a, 72.15.Qm
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