| Sumario: | The electrical resistivity of R2Fe14B (R=lanthanide series) polycrystalline samples was measured over the temperature range of 4–700 K. Even though the overall behavior of the resistivity in R2Fe14B is determined mainly by Fe atoms, interesting features follow from the presence of rare-earth atoms. At low temperatures, the resistivity ρ increases with temperature as T2. We find that scattering of electrons by modes involving all spins, with a dispersion given by the R-Fe exchange interaction, contributes to this behavior. On the other hand, the high-temperature anomaly in ρ observed just below the Curie temperature is quite likely produced by electron-phonon scattering arising from a pronounced lattice softening in this temperature region. Saturation values of the high-temperature magnetic resistivity are in agreement with de Gennes and Friedel's prediction for spin-disorder scattering.
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