Mapping the structural transitions controlled by the trilinear coupling in Ca3- xSr x Ti2O7

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Title
Mapping the structural transitions controlled by the trilinear coupling in Ca3- xSr x Ti2O7
Author(s)
Marie Kratochvilova; Fei-Ting Huang; Maria-Teresa Fernandez Diaz; Milan Klicpera; Sarah J. Day; Stephen P. Thompson; Yoon-Seok Oh; Bin Gao; Sang-Wook Cheong; Je-Geun Park
Publication Date
2019-06
Journal
JOURNAL OF APPLIED PHYSICS, v.125, no.24, pp.244102 -
Publisher
AMER INST PHYSICS
Abstract
© 2019 Author(s).We present the results of the high-temperature neutron and x-ray diffraction experiments on the Ca3-xSrxTi2O7 (x = 0.5, 0.8, 0.85, 0.9) compounds. The ferro- to paraelectric transition in these hybrid improper ferroelectric materials arises from the so-called trilinear coupling. Depending on the strontium content, various structures and phase transitions, different from theoretical predictions, emerge. The in situ x-ray powder diffraction indicates a direct ferro- to paraelectric transition between the orthorhombic A21am and the tetragonal undistorted I4/mmm phase for x ≤ 0.6. We identified a reduction in the trilinear coupling robustness by increasing the Sr-doping level to lead to the emergence of the intermediate tetragonal P42/mnm phase and the gradual suppression of the orthorhombic phase. The observed character of the structure transitions and the Ca3-xSrxTi2O7 phase diagram are discussed in the framework of theoretical models of other related hybrid improper ferroelectric systems.
URI
https://pr.ibs.re.kr/handle/8788114/6099
ISSN
0021-8979
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
Files in This Item:
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