Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2003-03-18
Phys. Rev. B 68, 045202 (2003)
Physics
Condensed Matter
Strongly Correlated Electrons
Revtex4, 20 figures. References updated, minor changes to figures and text
Scientific paper
10.1103/PhysRevB.68.045202
Dynamical and transport properties of a simple single-band spin-fermion lattice model for (III,Mn)V diluted magnetic semiconductors (DMS) is here discussed using Monte Carlo simulations. This effort is a continuation of previous work (G. Alvarez, Phys. Rev. Lett. 89, 277202 (2002)) where the static properties of the model were studied. The present results support the view that the relevant regime of J/t (standard notation) is that of intermediate coupling, where carriers are only partially trapped near Mn spins, and locally ordered regions (clusters) are present above the Curie temperature T_C. This conclusion is based on the calculation of the resistivity vs. temperature, that shows a soft metal to insulator transition near T_C, as well on the analysis of the density-of-states and optical conductivity. In addition, in the clustered regime a large magnetoresistance is observed in simulations. Formal analogies between DMS and manganites are also discussed.
Alvarez Gonzalo
Dagotto Elbio
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