THEORY OF IMPURITY-CONCENTRATION DEPENDENCE OF FREEZING TEMPERATURES OF METALLIC SPIN-GLASSES

We present a theory of the freezing temperature T(g) of metallic spin glasses. Length scales associated with intrinsic sd scattering and finite temperature play essential roles. We describe an approach in which T(g) is calculated directly in terms of the strength and range of the effective spin-spin pair interactions. The theory leads to a clear physical picture of the dependence of T(g) on the concentration and type of impurities in the spin glass, and provides a comprehensive account of a wide range of experimental data.