Abstract
Our previously developed trial function scheme has been generalized to finite temperatures in order to investigate the thermodynamic properties of the nondegenerate Wolff model. Using a “microcanonical ensemble ansatz”, the change of free energy due to the introduction of a single impurity to the host metal has been derived. The impurity contributions to the thermodynamic quantities can then be calculated. We found a broad maximum for the specific heat. The magnetic susceptibility is temperature-insensitive at lower T, and turns into the Curie-Weiss behavior at higher T. The effective local moment vanishes at T = 0, while with rising T it increases to a saturated value of reduced moment. Such characteristic features agree qualitatively with the experimental findings.
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