Proportional relation between magnetoresistance and entropy suppression due to magnetic field in metallic ferromagnets -: art. no. 092401

A temperature-independent proportional relation was discovered between magnetoresistance and magnetoentropy in metallic ferromagnets, La0.6Sr0.4CoO3, SrRuO3, and CoPt3 up to 90 kOe above, at, and just below Curie temperature. This concludes that the magnetoresistance due to suppression of spin-disorder scattering is well scaled by the magnetic entropy rather than the magnetization. In contrast, no proportional relation was observed in La0.825Sr0.175MnO3, which is understood by the characteristic magnetoresistance originating from Jahn-Teller effect and electronic phase separation.