Lee-Yang Theorem and the Griffiths Inequality for the Anisotropic Heisenberg Ferromagnet
- 22 June 1970
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 24 (25), 1409-1411
- https://doi.org/10.1103/physrevlett.24.1409
Abstract
It is shown that the zeros of the partition function of the anisotropic Heisenberg ferromagnet locate on the unit circle in the complex "fugacity" plane, and all the spin correlation functions are non-negative when no external magnetic field is present.Keywords
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