A method for engineering the nearly perfect single domain state in the ferroelastic phase of strontium titanate single crystal is presented. It combines shaping and the action of a strong dc electric field which is not conjugate with the order parameter. The single domain formation is attributed to domain wall motion due to anisotropic electrostriction, which switches residual odd-oriented domains into the axially oriented state. This feature seems to hint at ferrobielectric or ferroelastobielectric behavior.
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Dec et al. (2004) studied this question.
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