Reentrant orientational phase transitions and critical points at quantum orientational melting

An effect is studied of the crystal field on a system of rotors under the conditions of quantum orientational melting. It is shown that even very small crystal fields can substantially change the behavior of the system: at a certain positive value of the crystal field, a critical point appears at th...

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Bibliographic Details
Published in:Journal of low temperature physics 1998-01, Vol.110 (1-2), p.147-152
Main Authors: Freiman, Yu A, Tretyak, S, Jezowski, Andrzej
Format: Article
Language:English
Subjects:
Magnetization
Melting
Phase separation
Quantum theory
Online Access:Get full text
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Summary:An effect is studied of the crystal field on a system of rotors under the conditions of quantum orientational melting. It is shown that even very small crystal fields can substantially change the behavior of the system: at a certain positive value of the crystal field, a critical point appears at the `classical' side of the phase separation line; another critical point appears at the `quantum' side with further increasing of the field; then these critical points degenerate into a multicritical point and then the phase separation line disappears. For negative crystal fields stable states of the system of rotors can exist with a negative order parameter which can be treated as the orientational analog of the easy-plane-type ordering in magnets.
ISSN:0022-2291
DOI:10.1023/a:1022583221754