Abstract
The solution of the zero-field "eight-vertex" model is presented. This model includes the square lattice Ising, dimer, ice, , and KDP models as special cases. It is found that in general the free energy has a branch-point singularity at a phase transition, with a continuously variable exponent.
- Received 25 February 1971
DOI:https://doi.org/10.1103/PhysRevLett.26.832
©1971 American Physical Society
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Letters from the Past - A PRL Retrospective
2008 marked PRL’s 50th anniversary. As part of the celebrations a collection of milestone Letters was started. The collection contains Letters that have made long-lived contributions to physics, either by announcing significant discoveries, or by initiating new areas of research.