Abstract
The magnetic properties of FeCl2, in which neutron diffraction experiments show that the metal atoms form ferromagnetic layers with alternate layers aligned antiparallel, are calculated using the Bethe-Peierls method. Account is taken of a ferromagnetic interaction of strength JF between nearest neighbours in a layer and an antiferromagnetic interaction of strength JA between next nearest neighbours in adjacent layers. Expressions are obtained for the usual thermodynamic functions as well as the critical scattering cross sections and are compared with experimental observations. The magnitudes of the interactions are found to be JF = 8.53K, JA = 0.69K, and with these values reasonable agreement is found between theory and experiment.
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