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Non-critical behaviour of the antiferromagnetic frustrated spinel ZnCr 1.6 Ga 0.4 O 4 near its freezing temperature

1986; IOP Publishing; Volume: 19; Issue: 33 Linguagem: Inglês

10.1088/0022-3719/19/33/012

1747-3802

J. Hammann, D. Fiorani, M. El Yamani, J.L. Dormann,

Physics of Superconductivity and Magnetism

Many experimental results have indicated the existence of a freezing temperature of about 2.5 K and an overall behaviour equivalent to that of a spin glass state. The analysis of field cooled DC magnetisation measurements however shows that no critical behaviour appears in the first coefficients of the non-linear susceptibility. It is suggested that the very high degree of frustration prevents the development of a true spin glass transition. A simple model with uncompensated antiferromagnetic clusters consistently accounts for the observed properties.