Ground state and ordering of a quantum crystal in the case of a pseudospin <i>S</i> = 1
V. L. KovarskiĭPhysicotechnical Institute of the Academy of Sciences of the Ukrainian SSR, DonetskB. Ya. SukharevskiǐPhysicotechnical Institute of the Academy of Sciences of the Ukrainian SSR, Donetsk
ABI
Abstract
The structure of the ground state of a pseudospin system was studied in the molecular-field approximation taking into account tunneling. The case of a potential with three minima, corresponding to the pseudospin S = 1, and ferrodistortional ordering was studied. A first-order phase transition between the ordered and disordered phases at T = 0 was found. The possibility of the formation of a partially ordered antiisostructural phase, associated with tunneling, was studied. It was established that in the cases studied such a phase does not exist.
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