Theory of the Reentrant Charge-Order Transition in the Manganites

Details Theory of the Reentrant Charge-Order Transition in the Manganites Theory of the Reentrant Charge-Order Transition in the Manganites

2000-10-26

arxiv.org/abs/cond-mat/0010429v1

Physics

Condensed Matter

Strongly Correlated Electrons

3 pages, 2 ps figures included in text, submitted to the 8th MMM-Intermag conference

Scientific paper

10.1063/1.1358326

A theoretical model for the reentrant charge-order transition in the manganites is examined. This transition is studied with a purely electronic model for the Mn electrons: the extended Hubbard model. The electron-phonon coupling results in a large nearest-neighbor repulsion between electrons. Using a finite-temperature Lanczos technique, the model is diagonalized on a 16-site periodic cluster to calculate the temperature-dependent phase boundary between the charge-ordered and homogeneous phases. A reentrant transition is found. The results are discussed with respect to the specific topology of the 16-site cluster.

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