Various Possible Forms of Absolute-Type Ferroelectro-Incommensurateness
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Phases that are incommensurate but yet also ferroelectric are possible, A ferroelec-tric incommensurate phase of the absolute type is defined as an incommensuratephaseinwhichthere]ationP=/(l0.1', l(),l', l0,l',-?-)holdsandwhichhasP.:0through this relation. Here P denotes a polarization component; P. is its spatialaverage; Q., Q:, Q. etc. compose a degenerate set of order parameters; f is a functionof only the absolute magnitudes (not depending on the arguments) of the orderparameters. No possible specific forms of the above function have been known, ex-cept the simplest form P=J( l Q. l ' - l Q, l '), where J is a mere coefficient. The presentpaper shows a variety of specific forms and the cases where they occur. Some of thesecases are particularly discussed.
- 一般社団法人日本物理学会の論文
- 1988-08-15
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