Pretransitional Condensation of Some Hard Modes in an Incommensurately Undulated Prototypic Phase. Its Influence on the Transition Temperature

概要

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Even a hard mode of lattice vibration belonging to a nonidentity irreducible representation is condensed in the prototypic phase, if an R-linear term such as ∂_zR or ∂^2_<xy>R exists in the free energy function (R denotes the coordinate of the hard mode) and if the prototypic phase is suitably undulated. A detailed account of the above is given. If the soft mode only is taken into consideration and this mode is not condensed in the prototypic phase, the prototypic-to-ferroic transition temperature necessarily rises with increasing U (U denotes the amplitude of undulation of the prototypic phase). However, if the hard modes condensed in the prototypic phase are taken into consideration, the transition temperature does not necessarily rise but can fall with increasing U. A detailed account of the above is given.
社団法人日本物理学会の論文
1995-04-15