Abstract
Anomalous behavior of the magnetic part of rare-earth intermetallic resistivity in the paramagnetic phase is analyzed as an effect of free electron scattering on collective excitations in magnetic ion system. A simple model of Boltzmann equation formalism with the Born approximation for the resistivity and molecular field-random phase approximation (MFA-RPA) for the excitation spectra is used. We show that the negative temperature coefficient of the resistivity above certain temperature T max , close to or considerably greater than the magnetic phase transition temperature T c , is a manifestation of the magnetic excitations critical behavior. The anomaly conditions are formulated and the crystal field splitting influence on T max is estimated. The analysis is based on the resistivity calculations for REIn 3 ( RE = Gd , Tb, Tm) and their comparison to experimental data.
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