Transport Properties of the Europium Chalcogenides

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.