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Phase Diagram of the Spin-1 XXZ Heisenberg Ferromagnet with a Single-Ion Anisotropy
並列摘要
The phase diagram of the spin-1 quantum Heisenberg model with both exchange as well as single-ion anisotropy is constructed, within the framework of the pair approximation formulated as a variational procedure based on the Gibbs-Bogoliubov inequality. In this form the adapted variational approach is used to obtain results equivalent to the Oguchi pair approximation. It is shown that the single-ion anisotropy induces a tricritical behavior in the model system considered, and the location of the tricritical point is found in terms of its dependence on the exchange anisotropy strength.
並列關鍵字
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