Disorder in Diluted Spin Systems

Details Disorder in Diluted Spin Systems Disorder in Diluted Spin Systems

2004-08-02

arxiv.org/abs/cond-mat/0408039v1

Phys. Rev. B 70, 165203 (2004)

Physics

Condensed Matter

Disordered Systems and Neural Networks

9 pages, 6 figures

Scientific paper

10.1103/PhysRevB.70.165203

The influence of substitutional disorder on the magnetic properties of diluted Heisenberg spin systems is studied with regard to the magnetic stability of ferromagnetic diluted semiconductors (DMS). The equation of motion for the magnon Green's function within Tyablikov approximation is solved numerically for finite systems. The resulting spectral density is then used to estimate the magnetization and Curie temperature of an infinite system. This method is suitable for any form of a ferromagnetic exchange interaction. Besides different lattices and spin magnitude $S$, exchange interactions of different range are examined. The results show that, for short-range interaction, no magnetic order exists below the critical percolation concentration, whereas a linear dependence of the Curie temperature on the concentration of spins is found for ferromagnetic long-range interaction.

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