Issue
J. Phys. Colloques
Volume 49, Number C8, Décembre 1988
Proceedings of the International Conference on Magnetism
Page(s) C8-1547 - C8-1548
DOI https://doi.org/10.1051/jphyscol:19888708
Proceedings of the International Conference on Magnetism

J. Phys. Colloques 49 (1988) C8-1547-C8-1548

DOI: 10.1051/jphyscol:19888708

PHASE TRANSITIONS IN COUPLED SPIN SYSTEMS

S. Galam1 et M. Gabay2

1  Département de Recherches Physiques, Tour 22-E.3, Université P. et M. Curie, 75252 Paris Cedex 05, France
2  Laboratoire de Physique des Solides, Université Paris-Sud, 91405 Orsay, France


Abstract
A simple coupled spin model is presented to describe the phase diagram of plastic crystals. Translational and rotational degrees of freedom are associated respectively with a lattice-gaz Hamiltonian and a q-Potts Hamiltonian. A tetralinear coupling between rotations and translations is considered. Effects of adding random fields which couple solely to the Potts variables are studied.