Anomalous spin susceptibility and magnetic polaron formation in the double-exchange systems

Article

关键词: COLOSSAL-MAGNETORESISTANCE MANGANITES;    MIXED-VALENCE MANGANITES;    PHASE-DIAGRAM;    LA1-XSRXMNO3;    MODEL;    LOCALIZATION;    RESISTIVITY;    TEMPERATURE;    TRANSPORT;    CROSSOVER;   

DOI  :  10.1103/PhysRevB.61.9501

来源: SCIE

【 摘 要 】

The magnetic susceptibility and spin-spin correlation of the double-exchange model for doped manganites are investigated through the Monte Carlo calculations on the three-dimensional lattice model. Deviations of the susceptibility from the Curie-Weiss behavior above the ferromagnetic ordering temperature T-c seem to indicate a formation of local ferromagnetic clusters in the vicinity of T-c which is consistent with recent electron paramagnetic resonance experiments for La2/3Ca1/3MnO3. A further analysis of the spin-spin correlations show the ferromagnetic cluster size to be three-to-four lattice spacings, suggesting that the charge carriers may form magnetic polarons.

【 授权许可】

Free