The powder susceptibility of CsNiCl3 has been measured from 1.3 to 130°K. The results, indicative of one-dimensional antiferromagnetic interactions, are used to test the one-dimensional Ising model for spin unity, and the Fisher model utilizing the classical Hamiltonian for infinite spin. The Fisher model with J = − 14.2k is found to give the better fit, but both models are found to deviate appreciably from the experimental results for kT less than J.
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Smith et al. (1970) studied this question.
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