Quantum fluctuations in a two-dimensional antiferromagnet with four-spin interaction of cubic symmetry |
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| Authors: | V V Val’kov T A Val’kova A A Shklyaev |
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| Institution: | (1) University of Manchester, School of Mathematics, Oxford Road, M13 9PL Manchester, UK;(2) Health Methodology Research Group, University of Manchester, School of Community-Based Medicine, Jean McFarlane Building, University Place, M13 9PL Manchester, UK; |
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| Abstract: | The excitation spectrum of a non-Heisenberg 2D antiferromagnet with the four-spin interaction of cubic symmetry has been calculated
in the first order of 1/2S. It has been shown that, for weak anisotropy, the Néel state is destroyed by quantum fluctuations. The phase diagrams showing
the stability regions of the Néel phase in the space of spin-anisotropy parameters have been plotted. |
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