Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 21, Issue 50, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/21/50/506006
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Funding
- Brazilian Agencies CNPq
- FAPERGS [PRONEX 04.0938.0]
- FAPERJ
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The static critical phenomenology near the Curie temperature of the re-entrant metallic alloys Au(0.81)Fe(0.19), Ni(0.78)Mn(0.22), Ni(0.79)Mn(0.21) and amorphous a-Fe(0.98)Zr(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 are distributed within a certain range around average values.
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