Open AccessDisordered ferroelectricity in the PbTiO3/SrTiO3 superlattice thin film
Author(s) -
GiYeop Kim,
Kanghyun Chu,
K. D. Sung,
Hak-Sung Lee,
SungDae Kim,
Kyung Song,
Taekjib Choi,
Jaichan Lee,
J. P. Buban,
Seog-Young Yoon,
Kwang Ho Kim,
ChanHo Yang,
SiYoung Choi
Publication year - 2017
Publication title -
apl materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.571
H-Index - 60
ISSN - 2166-532X
DOI - 10.1063/1.4986064
Subject(s) - superlattice , materials science , thin film , ferroelectricity , tetragonal crystal system , condensed matter physics , dielectric , piezoelectricity , polarization (electrochemistry) , crystallography , optoelectronics , nanotechnology , crystal structure , composite material , physics , chemistry
The PbTiO3/SrTiO3 superlattice thin films with a low volume fraction of PbTiO3 have not attracted much interest because they are thought to exhibit only a paraelectric state. In this study, we focus on a superlattice thin film with thin PbTiO3 (PTO) and thick SrTiO3 (STO) layers, wherein the hidden ferroelectricity in the thin PbTiO3 layer is revealed. Atomic scale imaging analysis and electron energy loss spectroscopy reveal the existence of a disordered ferroelectric polarization state without innate tetragonal distortion in the (6PTO/15STO)5 superlattice. The piezoelectric force microscopy analysis confirms that this disordered ferroelectricity can enhance piezoelectric response
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