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We have studied critical phenomena of spin glass transition for larger Dzyaloshinsky–Moriya anisotropy Heisenberg spin glass system, PtMn. The analysis of nonlinear magnetizations in the framework of the existence of a phase transition at Tg yields the critical exponents δ = 2.5 ± 0.3, γ = 1.5 ± 0.3 and β = 1 ± 0.3. These results suggest that the universality class of spin glass transition on PtMn is the same as those of CuMn, AgMn and AuFe systems. Experimentally, there is an indication of a unique universality class for Heisenberg spin glass materials.

Critical phenomena of canonical spin glass systems with large Dzyaloshinsky–Moriya anisotropy