Navegando por Autor "Montenegro, F. C."
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Artigo Mössbauer study of spin-glass Fe x Zn1−x F2 system(Hyperfine Interaction, 1991-11) Araújo, Jose Humberto de; Cunha, Joao Batista Marimon da; Vasquez, A.; Amaral, L.; Moro, J. T.; Montenegro, F. C.; Rezende, S. M.; Coutinho-Filho, Mauricio D.57Fe Mössbauer effect measurements in the diluted Ising antiferromagnet Fe x Zn1−x F2 withx=0.25 andx=0.57 at temperatures between 4.2 and 55 K, are reported. DC suceptibility measurements show a spin-glass (SG) phase at low temperatures forx≤0.31. Our Mössbauer spectra show a phase transition to a SG state with antiferromagnetic order (AFSG) forx=0.25 and only antiferromagnetic order forx=0.57.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