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Transport properties of 2% Gd-doped EuO with Tc≈123°K have been investigated. The resistivity anomaly in the neighborhood of Tc can be explained satisfactorily by critical scattering theory. Estimates of the exchange interaction between conduction electrons and localized spins are found to vary from 4.9×10−2 eV in Gd :EuO to 4.3×10−2 eV in Gd :EuS.
Molnár et al. (Sun,) studied this question.