Models for the phase diagrams of A2BX4and similar compounds
- 1 December 1991
- journal article
- Published by Taylor & Francis in Ferroelectrics
- Vol. 124 (1), 41-48
- https://doi.org/10.1080/00150199108209412
Abstract
Incommensurate systems have been studied on a number of essentially onedimensional models. Examples are the ANNNI and the DIFFOUR models. These have one degree of freedom per site. The incommensurate phases of a large class of compounds with basic structure belonging to the space group Pcmn can qualitatively be understood with these models. Here two types of generalizations are discussed. First models with more degrees of freedom per site are studied. These give the possibility to restrict the range of the interactions. In the second place a coupling to elastic degrees of freedom is discussed. This may influence the type of phase transition. For strong enough coupling a second-order transition may turn into a first-order one.Keywords
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