Theory of the Reentrant Charge-Order Transition in the Manganites

Abstract

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.

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

References in corpus (4)

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• The extended Hubbard model in the ionic limit
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• The Hubbard model with intersite interaction within the Composite Operator Method
• Charge fluctuations in the unconventional metallic state of Li0.9Mo6O17
• Exact ground states for the four-electron problem in a two-dimensional finite Hubbard square system
• One-particle spectral properties of the t-J-$V$ model on the triangular lattice near charge order
• Finite-Temperature Properties across the Charge Ordering Transition -- Combined Bosonization, Renormalization Group, and Numerical Methods