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Название: Phase Transitions in Quantum Spin Systems with Isotropic and Nonisotropic Interactions
Автор: Dyson F.J.
We prove the existence of spontaneous magnetization at sufficiently low temperature, and hence of a phase transition, in a variety of quantum spin systems in three or more dimensions. The isotropic spin 1/2x-y model and the Heisenberg antiferromagnet with spin 1, 3/2,...and with nearest neighbor interactions on a simple cubic lattice are included.