Wall-wall and kink-kink interactions in ferroelastic materials

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Lu, G 
Ding, X 
Sun, J 

Kinks interact with other kinks and antikinks elastically in ferroelastic domain walls and other interfaces in ferroic materials. In thin samples, suitable for transmission electron-microscopy, the interaction is purely dipolar with no indication of monopolar or higher order contributions. Kinks and antikinks attract each other while kink-kink interactions are repulsive. When the kinks are situated in two parallel twin walls, they display the same attraction/repulsion. We argue that this interaction constitutes, part or all, the elusive wall-wall interaction in ferroelastics. The dipolar interactions over distances d between the kinks and between walls decay as 1/d2 when the samples have some nano-scale size. Nano-scale samples bend and tilt when kinks are introduced with typical bent regions of some 1 nm and tilt angles of some 1.2o. Multiple kinks will enhance the effect systematically and bent and modulated twin walls are predicted.

5108 Quantum Physics, 51 Physical Sciences
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Physical Review B
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American Physical Society (APS)
Engineering and Physical Sciences Research Council (EP/P024904/1)
European Commission Horizon 2020 (H2020) Marie Sk?odowska-Curie actions (861153)