Navegando por Autor "Amara, Lovelyn"
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Artigo Spin freezing of the spin-glass Fe0.25Zn0,75F2: a Mossbauer study(Brazil Journal Physics, 1991-01) Araújo, José Humberto de; Cunha, Joao Batista Marimon da; Vasquez, Adalberto; Montenegro, F. C.; Rezende, S. M.; Amara, Lovelyn; Moro, J. T.; Coutinho-Filho, Mauricio D.We report 57~e Mõssbauer measurements in the diluted Ising antiferromagnet Fe0.25Zn0,75F2 at temperatures between 4.2 and 28 K. DC susceptibility measurements in the same sample show a spin-glass phase at a freezing temperature Tg = 10K. We found that for this concentration there is a competitive coexistence of spin-glass behaviour and antiferromagnetic order. The freezing temperature is frequency-dependent and follows a power law