Two-component approach for thermodynamic properties in diluted magnetic semiconductors

Details Two-component approach for thermodynamic properties in diluted magnetic semiconductors Two-component approach for thermodynamic properties in diluted magnetic semiconductors

2001-02-17

arxiv.org/abs/cond-mat/0102315v3

Phys. Rev. B 65, 115308 (2002).

Physics

Condensed Matter

Disordered Systems and Neural Networks

10 pages, 9 figures, 1 new figure, substantial revisions

Scientific paper

10.1103/PhysRevB.65.115308

We examine the feasibility of a simple description of Mn ions in III-V diluted magnetic semiconductors (DMSs) in terms of two species (components), motivated by the expectation that the Mn-hole exchange couplings are widely distributed, expecially for low Mn concentrations. We find, using distributions indicated by recent numerical mean field studies, that the thermodynamic properties (magnetization, susceptibility, and specific heat) cannot be fit by a single coupling as in a homogeneous model, but can be fit well by a two-component model with a temperature dependent number of ``strongly'' and ``weakly'' coupled spins. This suggests that a two-component description may be a minimal model for the interpretation of experimental measurements of thermodynamic quantities in III-V DMS systems.

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