ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
In this paper we have investigated the ground state of an easy-plane spin-one ferromagnet: H = D∑i(Sxi)2 −(J/2)∑(i, j)Si⋅Sj −h∑iSzi, using the coupled-cluster method. The mean-field approximation is commonly used in calculations of thermodynamic quantities for such systems because of the complexities caused by the single-ion anisotropy term. However, in the mean-field approximation both quantum and spin fluctuation correlations are neglected. Above the critical point, the zero-temperature series expansion method has been used to obtain estimates of the critical crystal field potential (Dc) and critical exponent of the susceptibility. Using the coupled-cluster method we obtained the ground-state energy, magnetization and critical point for both two- and three-dimensional lattices.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.350052
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