Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2006-03-18
Physics
Condensed Matter
Other Condensed Matter
4 pages, 4 eps figures
Scientific paper
10.1103/PhysRevB.73.180404
The ferromagnetic (FM) transition temperature (Tc) of a two-band Double-Exchange (DE) model for colossal magnetoresistance (CMR) materials is studied using dynamical mean-field theory (DMFT), in wide ranges of coupling constants, hopping parameters, and carrier densities. The results are shown to be in excellent agreement with Monte Carlo simulations. When the bands overlap, the value of Tc is found to be much larger than in the one-band case, for all values of the chemical potential within the energy overlap interval. A nonzero interband hopping produces an additional substantial increase of Tc, showing the importance of these nondiagonal terms, and the concomitant use of multiband models, to boost up the critical temperatures in DE-based theories.
Dagotto Elbio
Popescu Florin
Şen Cengiz
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