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Transport properties of pure and doped Eu chalcogenides are reviewed to determine the mechanisms responsible for the anomalous behavior near T c , the Curie temperature. It is found that, whereas the scattering theory of simple metals accounts for the behavior of materials containing impurities in excess of 2 × 10 20 cm −3 , several models for transport have been proposed for smaller concentrations. The impurity hopping model appears to be consistent with the data for very dilute systems.
S. von Molnár (Fri,) studied this question.