Temperature Dependences of Linear Electro-Incommensurate Constants in the Vicinity of the Transition from a Prototypic Phase to a Simultaneously Incommensurate and Ferroelectric Phase
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The material constants that characterize simultaneously incommensurate and fer-roelectric phases are linear electro-incommensurate constants, such as clh /dB,clq. / c1E and dq. / dB, where E denotes an electric field applied in the direction of spontaneous polarization, h the wavenumber of the first harmonic (the fundamental wave)in Q (any one of the order parameters), q. the amplitude of the first harmonic, and q.the amplitude of the wth harmonic (a high harmonic). One typical case is investigated,namely the P4b2-(I / 2, 0, 0) case. In this case, a ferroelectric incommensurate phaseof the absolute type is possible. The transition between this phase and the prototypicphase can be second order. The expressions of the temperature dependences of almostall linear electro-incommensurate constants in the vicinity of the mentioned transitionare presented.
- 社団法人日本物理学会の論文
- 1991-05-15
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