Hysteresis and relaxation behavior in diluted A2Fe(1-x)In(x)Cl(5)center dot H2O (A=K,Rb)

Hysteresis and relaxation behavior in diluted A2Fe(1-x)In(x)Cl(5)center dot H2O (A=K,Rb)

Autor Becerra, C. C. Google Scholar
Barbeta, V. B. Google Scholar
Paduan, A. Google Scholar
Palacio, F. Google Scholar
Campo, J. Google Scholar
Gabas, M. Google Scholar
Instituição UNIV ZARAGOZA
Universidade Federal de São Paulo (UNIFESP)
Resumo Low-anisotropy antiferromagnetic compounds of the general formula A(2)Fe(1-x)In(x)Cl(5) . H2O (A = K,Rb) exhibit a net spontaneous magnetization below their transition temperature (T-N) when they are cooled in very small applied magnetic fields. This magnetization is observed when the easy axis of the system is aligned parallel to the field and is found to saturate at fields of a few Oe. Hysteresis loops M vs H have been obtained at several temperatures for single crystals of samples with different concentrations x. for low values of x the loops are not symmetric and show a series of well-defined jumps. This behavior suggests that a structure of domains is present, the jumps being associated with avalanche-type movements of the antiferromagnetic domain walls. the coercive fields are of the order of a few hundreds of Oe and for similar x are lower in the Rb-based samples than in the K ones. When the applied field is removed below T-N some of the samples of the dilute rubidium derivative show relaxation effects. the drop in M after the field is removed is two orders of magnitude larger than the drop expected from the susceptibility term (chi parallel to H) the origin of the net magnetization in this and in other dilute antiferromagnets has not yet been established but net domain wall magnetization of antiferromagnetic domains is suggested as the most consistent mechanism.
Idioma Inglês
Data de publicação 1997-08-01
Publicado em Physical Review B. College Pk: American Physical Soc, v. 56, n. 6, p. 3204-3211, 1997.
ISSN 0163-1829 (Sherpa/Romeo, fator de impacto)
Publicador American Physical Soc
Extensão 3204-3211
Fonte http://dx.doi.org/10.1103/PhysRevB.56.3204
Direito de acesso Acesso restrito
Tipo Artigo
Web of Science WOS:A1997XR29000048
Endereço permanente http://repositorio.unifesp.br/handle/11600/25776

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