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

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

1999-10-11

arxiv.org/abs/cond-mat/9910153v1

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 5 figures, Latex

Scientific paper

10.1103/PhysRevB.61.9501

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 La$_{2/3}$Ca$_{1/3}$MnO$_3$. 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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