Linear Antiferromagnetism in Spin-1 Systems; CsNiCl3

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 $\text{J\hspace{0.17em}=\hspace{0.17em}−\hspace{0.17em}14.2k}$ is found to give the better fit, but both models are found to deviate appreciably from the experimental results for $\mathrm{kT}$ less than $J$ .