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Mattis, Daniel C. | Ground-state symmetry in XY model of magnetism | Numerical studies by Betts and Oitmaa have led those authors to conjecture that in the XY model the ground-state magnetization Mz is zero. This is a model of spins on a lattice with interactions - J(SnxSmx+SnySmy), that can also describe a hard-sphere boson fluid. In the present note I prove the c... | Ground state; Magnetization; Bipartite lattice | 1979-06 |
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