Abstract
Some effects of alloy substitution for U in UAl 2 were studied by X-ray diffraction, magnetic susceptibility and specific heat measurements. The substituents include Y, La, Lu, Ce, Sc, Zr. We have found miscibility gaps with rare earth substitutions which cannot be explained by an atomic size effect. Our low temperature magnetic susceptibility measurements show large increases for the La and Y substitutions while other substituents had much smaller effects. We attribute the miscibility gaps and the differences in magnetic susceptibility to bond breaking by the substituents. We find the specific heat of the La substitutions to be still consistent with a spin fluctuation description and have calculated parameters using this model from our data.
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