Ordering of quantum lattice gas in a model of nonequivalent sublattices
V. L. KovarskiĭPhysicotechnical Institute, Academy of sciences of the Ukrainian SSR, DonetskB. Ya. SukharevskiǐPhysicotechnical Institute, Academy of sciences of the Ukrainian SSR, Donetsk
ABI
Abstract
The ordering of a quantum lattice gas is considered in the case when the nonequilibrium potential contains terms of odd orders. The phase diagram is obtained for a model that correctly describes the phase transitions from the crystalline to the liquid state and to the superconducting state as first-order transitions. We investigate the possible existence of an anti-isostructural phase in which the partial diagonal (crystalline) order and the nondiagonal order have the same symmetry, which corresponds to k≠0. This phase has been found not to exist in the model under consideration.
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