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

Abstract

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.