Abstract
We calculate the high-field and low-field in-plane magnetic susceptibilities of the transition metal chloride graphite intercalation compounds (GIC) whose spins are confined to the plane. We show that the two observed low temperature susceptibility peaks can be due to a single phase transition which occurs near the higher temperature peak. The model assumes superferromagnetism, intra-plane and inter-plane super-moment interactions, and plane to plane variations of the intercalant concentration. The parameters which we introduce are estimated for several compounds. The resultant susceptibility curves have the observed temperature and field dependences and many other formerly peculiar aspects of the magnetism are explained. Notibly, the exceptionally large magnitude of the measured susceptibility, the non-zero sample magnitization between the two susceptibility peaks, and the stage dependence of the susceptibility curves.
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