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2016 ; 6
(ä): 32216
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Polarization twist in perovskite ferrielectrics
#MMPMID27586824
Kitanaka Y
; Hirano K
; Ogino M
; Noguchi Y
; Miyayama M
; Moriyoshi C
; Kuroiwa Y
Sci Rep
2016[Sep]; 6
(ä): 32216
PMID27586824
show ga
Because the functions of polar materials are governed primarily by their
polarization response to external stimuli, the majority of studies have focused
on controlling polar lattice distortions. In some perovskite oxides, polar
distortions coexist with nonpolar tilts and rotations of oxygen octahedra. The
interplay between nonpolar and polar instabilities appears to play a crucial
role, raising the question of how to design materials by exploiting their
coupling. Here, we introduce the concept of 'polarization twist', which offers
enhanced control over piezoelectric responses in polar materials. Our
experimental and theoretical studies provide direct evidence that a ferrielectric
perovskite exhibits a large piezoelectric response because of extended polar
distortion, accompanied by nonpolar octahedral rotations, as if twisted
polarization relaxes under electric fields. The concept underlying the
polarization twist opens new possibilities for developing alternative materials
in bulk and thin-film forms.