Anomalous spin susceptibility and magnetic polaron formation in the double exchange systems
Abstract
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 Tc seem to indicate a formation of local ferromagnetic clusters in the vicinity of Tc, 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.
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