Order-parameter symmetries of domain walls in ferroelectrics and ferroelastics

Article

关键词: PHASE-TRANSITIONS;    BOUNDARIES;    MULTIFERROICS;    CRYSTAL;    BATIO3;   

DOI  :  10.1103/PhysRevB.89.134104

来源: SCIE

【 摘 要 】

The symmetry of boundaries between ferroelectric, ferroelastic, and antiphase domains is a key element for a theoretical understanding of their properties. Here, we derive this symmetry from their organic relation to the symmetry of the primary transition order parameters. The domain wall symmetries are shown to coincide with directions of the order-parameter n-dimensional vector space, corresponding to sum of the vectors associated with adjacent domain states. This property is illustrated by the determination of the maximal symmetries of domain walls in BaTiO3, LaAlO3, SrTiO3, and Gd-2(MoO4)(3). Besides, the domain pattern in YMnO3 is interpreted as resulting from an annihilation-creation process, the annihilation of the antiphase domain walls creating six ferroelectric domain walls merging at a single point.

【 授权许可】

Free