Spin correlations for a classical linear magnet with exchange and single-site anisotropy energies
- 21 November 1975
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 8 (22) , 3841-3856
- https://doi.org/10.1088/0022-3719/8/22/024
Abstract
Spin-correlation functions are calculated for the exactly soluble model of a one-dimensional array of classical spins interacting via a Heisenberg exchange and a single-site anisotropy of the form B(Sz)2. Analytic results are obtained in the limit low temperatures, and numerical results presented for general temperatures. For B positive, the spins align in the xy plane at low temperatures, with the inverse correlation length kz tending to a value proportional to B12/. For B negative, alignment occurs along the z direction at low temperatures. The divergence of the susceptibility chi z is of the form exp (constant/temperature).Keywords
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