Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-02-18
J. Phys.: Conf. Ser. 200, 012131 (2010)
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 4 figures, Proceedings for ICM2009
Scientific paper
10.1088/1742-6596/200/1/012131
The double-exchange model, which has been extensively studied in the context of colossal magneto-resistance in perovskite manganese oxides, is known to exhibit a ferromagnetic metallic state at low temperatures because of the interplay between localized moments and itinerant electrons through the Hund's-rule coupling. Here we investigate numerically the ferromagnetic transition in the double-exchange model defined on the frustrated pyrochlore lattice as a simple model for ferromagnetic pyrochlore oxides. We demonstrate that the finite-size corrections are largely reduced by implementing averages over the twisted boundary conditions in the Monte Carlo simulation, which enables to estimate the ferromagnetic transition temperature in relatively small size clusters. The estimate is compared with that for the non-frustrated cubic lattice system.
Furukawa Nobuo
Motome Yukitoshi
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