Static critical exponents of the ferromagnetic transition in spin glass re-entrant systems

Details Static critical exponents of the ferromagnetic transition in spin glass re-entrant systems Static critical exponents of the ferromagnetic transition in spin glass re-entrant systems

2009-04-22

arxiv.org/abs/0904.3481v1

Physics

Condensed Matter

Strongly Correlated Electrons

17 pages, 11 figures

Scientific paper

The static critical phenomenology near the Curie temperature of the re-entrant metallic alloys Au_0.81Fe_0.19, Ni_0.78Mn_0.22, Ni_0.79Mn_0.21 and amorphous a-Fe_0.98Zr_0.08 is studied using a variety of experimental techniques and methods of analysis. We have generally found that the values for the exponents alpha, beta, gamma and delta depart significantly from the predictions for the 3D Heisenberg model and are intermediate between these expectations and the values characterizing a typical spin glass transition. Comparing the exponents obtained in our work with indices for other re-entrant systems reported in the literature, a weak universality class may be defined where the exponents distribute within a certain range around average values.

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