Giant-magnetic clusters and susceptibility enhancement in Pd-Ni alloys

A recently developed formalism is used to calculate the saturation magnetization and temperature-dependent, exchange-enhanced Pauli susceptibility of paramagnetic and weakly ferromagnetic Pd-Ni alloys. The effects of quantum and thermal spin fluctuations are included in alloy calculations for the first time, through the use of a semiphenomenological theory consistent with the results of renormalization-group theory for the single-impurity problem. Two different cluster methods are used, both of which yield results superior to those of all previous theories and in good agreement with experiment.