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Specific heat, magnetic susceptibility, and resistivity of an U0.85La0.15Al2 alloy


The compound UAl2 exhibits ferromagnetic spin fluctuations at low temperatures. When 15 at.% La is substituted for U in UAl2, we find the low-temperature magnetic susceptibility increases by more than a factor of 2. We have also measured specific heat on this sample at low temperatures. We find that the electronic density of states has increased by 60% and the spin-fluctuation contribution has increased by a factor of 2. We conclude from these measurements that the Stoner enhancement factor has increased by 30% and the spin-fluctuation temperature has increased by 50% as compared with UAl2. In addition, we have measured the electrical resistivity of U0.85La0.15Al2. We find the residual resistivity to be approximately an order of magnitude larger than that of UAl2. We attribute this effect to the breaking of UU bonds by the La atoms. © 1983 The American Physical Society.

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