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    Small Energy Scale for Mixed-Valent Uranium Materials

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    We investigate a two-channel Anderson impurity model with a 5f15f^1 magnetic and a 5f25f^2 quadrupolar ground doublet, and a 5f25f^2 excited triplet. Using the numerical renormalization group method, we find a crossover to a non-Fermi liquid state below a temperature TT^* varying as the 5f25f^2 triplet-doublet splitting to the 7/2 power. To within numerical accuracy, the non-linear magnetic susceptibility and the 5f15f^1 contribution to the linear susceptibility are given by universal one-parameter scaling functions. These results may explain UBe13_{13} as mixed valent with a small crossover scale TT^*.Comment: 4 pages, 3 figures, REVTeX, to appear in Phys. Rev. Let