Peculiar rodlike diffuse critical scattering above the type-I antiferromagnetic (AF/D) phase transition has been observed in the actinide compound UAs and demonstrates that the transition is in the vicinity of a Lifshitz point. A mean-field theory is proposed based on an anisotropic Hamiltonian and provides a reasonable description of the results.
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Sinha et al. (1980) studied this question.
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