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

Abstract

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 $II{B}_{1-x}M{n}_{x}Te$ (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.

4 pages plus 3 postscript figures

References in corpus (3)

• Replica Symmetry Breaking in Short-Range Spin Glasses: Theoretical Foundations and Numerical Evidences
• Universal Finite Size Scaling Functions in the 3D Ising Spin Glass
• Chiral-glass transition and replica symmetry breaking of a three-dimensional Heisenberg spin glass

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• The three dimensional Heisenberg spin glass under a weak random anisotropy
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