Transitions to Simultaneously Incommensurate and Ferroelectric Phases When the Number of (Proper) Order Parameters Is One
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Transitions from prototypic phases to simultaneously incommensurate and fer-roelectric phases are possible even when the number of (proper) order parameters isone. A case is investigated where the prototype point group is mmm and the (proper)order parameter belongs to the zero-wavenumber irreducible representation, B... Asubsidiary order parameter, which is not soft like the proper one but moderatelyhard, is taken into account; it belongs to B... The B.. and B,. order parameters can beidentified with polarization components P, and P. respectively. The free energy func-lion contains term P, (P.8.P, -P,8.P.). This term can generate a phase incommen-surate in the z direction and ferroelectric in the y direction. Sufficient conditions arefound out for this ferroelectric incommensurate phase to outrival other ferroic phasesin succeeding the prototypic phase.
- 社団法人日本物理学会の論文
- 1991-10-15
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