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Monte Carlo simulations of magnetic order in Fe-doped manganites

AutorAlonso, J. L.; Gutiérrez, J.; Barandiarán, J. M.; Bermejo, Francisco Javier ; Brey, Luis
Palabras claveDoped manganites
Monte Carlo
Fecha de publicación1-feb-2008
CitaciónPhysica B: Condensed Matter 403(2-3): 394–397 (2008)
ResumenThe effect of Fe doping on the magnetic properties of La(0.7)Pb(0.3)Mn(1-x)FexO3 (x = 0, 0.05, 0.1, 0.15 and 0.2) manganites is studied by the Monte Carlo simulation technique. As a first approximation, by means of a simple Heisenberg Hamiltonian, experimental normalized magnetizations at low temperatures have been reproduced for concentrations of Fe (x<0.2), but the calculated order temperatures show a large deviation from the measured ones. This shortcoming can be corrected by using a one electron effective hopping semi-classical Hamiltonian, with a simplified expression for the kinetic energy of the free electrons, which also avoids time-consuming diagonalizations.
Descripción4 pages, 3 figures.-- Available online on Aug 15, 2007.-- Issue title: Proceedings of the Sixth International Symposium on Hysteresis Modeling and Micromagnetics (Naples, Italy Jun 4-6, 2007).
Versión del editorhttp://dx.doi.org/10.1016/j.physb.2007.08.058
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