Cooperative phenomena in non-Heisenberg spin model with two- and three-atom interactions

S.N. Mitra and K.G. Chakraborty

Physica A: Statistical Mechanics and its Applications, 1998, vol. 250, issue 1, 470-494

Abstract: In this paper we present a detailed study of the physical properties of a non-Heisenberg spin model described by a Hamiltonian which consists of an usual bilinear coupling with the nearest-neighbour coupling constant J and a three-site interaction measured by a coupling constant L. This study is based on irreducible Green’s function theory with appropriate refinements. The results for spontaneous magnetization, Curie temperature and the zero-field susceptibility have been derived. The agreement of some of these theoretical results with those obtained from exact high-temperature series expansion is satisfactory. The observed susceptibility data for a quadrinuclear cluster of chromium has been examined on the basis of the present theory.

Date: 1998
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:250:y:1998:i:1:p:470-494

DOI: 10.1016/S0378-4371(97)00553-0

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