Spin Glass Ordering in Diluted Magnetic Semiconductors: a Monte Carlo Study

Details Spin Glass Ordering in Diluted Magnetic Semiconductors: a Monte Carlo Study Spin Glass Ordering in Diluted Magnetic Semiconductors: a Monte Carlo Study

2000-02-21

arxiv.org/abs/cond-mat/0002327v2

Phys. Rev. B, 62 (2000) 4999

Physics

Condensed Matter

Disordered Systems and Neural Networks

4 pages plus 3 postscript figures

Scientific paper

10.1103/PhysRevB.62.4999

We study the temperature-dilution phase diagram of a site-diluted Heisenberg antiferromagnet on a fcc lattice, with and without the Dzyaloshinskii-Moriya anisotropic term, fixed to realistic microscopic parameters for $IIB_{1-x} Mn_x Te$ (IIB=Cd, Hg, Zn). We show that the dipolar Dzyaloshinskii-Moriya anisotropy induces a finite-temperature phase transition to a spin glass phase, at dilutions larger than 80%. The resulting probability distribution of the order parameter P(q) is similar to the one found in the cubic lattice Edwards-Anderson Ising model. The critical exponents undergo large finite size corrections, but tend to values similar to the ones of the Edwards-Anderson-Ising model.

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