Effect of crystal-field anisotropy on the magnetization of a spin pair within various decoupling schemes

The Green's function theory for a Heisenberg Hamiltonian with exchange parameter plus a single‐ion anisotropy term is applied to a system of two spins S = 1. In order to assess the accuracy of the various decoupling schemes of the Green's functions, which involve products of operators at t...

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Bibliographic Details
Published in:Physica Status Solidi (b) 2003-11, Vol.240 (1), p.213-219
Main Author: ILKOVIC, V
Format: Article
Language:English
Subjects:
75.10.Jm
75.30.Gw
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
General theory and models of magnetic ordering
Magnetic anisotropy
Magnetic properties and materials
Magnetically ordered materials: other intrinsic properties
Physics
Quantized spin models
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Summary:The Green's function theory for a Heisenberg Hamiltonian with exchange parameter plus a single‐ion anisotropy term is applied to a system of two spins S = 1. In order to assess the accuracy of the various decoupling schemes of the Green's functions, which involve products of operators at the same site, the magnetization of a spin pair is calculated within various decoupling procedures, and the results compared with exact solutions. (© 2003 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
ISSN:0370-1972
1521-3951
DOI:10.1002/pssb.200301875