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Title: Giant photoinduced lattice distortion in oxygen vacancy ordered SrCoO2.5 thin films

Abstract

Despite the progress in understanding the formation and migration of oxygen vacancies in strongly correlated complex oxides, few studies focused on the dynamic behaviors of the oxygen vacancies under the transient and non-equilibrium states. Here we report a series of multi-timescale ultrafast X-ray diffraction experiments using picosecond synchrotron and femtosecond table-top X-ray sources to monitor the structural dynamics in oxygen-vacancy-ordered SrCoO2.5 thin films excited by photons. A giant photoinduced structure distortion in c-axis direction (with strain Δc/c > 1 {%}) was observed, higher than any previously reported data in the other transition metal oxide films. The femtosecond X-ray diffraction reveals the formation and propagation of the coherent acoustic phonons, indicating an instantaneous and a much larger photoinduced stress within the first 100 ps. Density Function Theory reproduced the photostrictive responses and the strong dependence on excitation wavelength as observed in the experiment. The combined experimental and theoretic results demonstrate that the photoexcitation of bonding to antibonding state via charge transfer is the dominant mechanism in the SrCoO2.5 thin films distinct from the depolarization effect by photoinduced carriers in the other perovskite oxides.

Authors:
; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
National Natural Science Foundation of China (NNSFC); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1576749
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Physical Review, B: Condensed Matter
Additional Journal Information:
Journal Volume: 100; Journal Issue: 14
Country of Publication:
United States
Language:
English

Citation Formats

Zhang, Bingbing, He, Xu, Zhao, Jiali, Yu, Can, Wen, Haidan, Meng, Sheng, Bousquet, Eric, Li, Yuelin, Jin, Kuijuan, Tao, Ye, and Guo, Haizhong. Giant photoinduced lattice distortion in oxygen vacancy ordered SrCoO2.5 thin films. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.100.144201.
Zhang, Bingbing, He, Xu, Zhao, Jiali, Yu, Can, Wen, Haidan, Meng, Sheng, Bousquet, Eric, Li, Yuelin, Jin, Kuijuan, Tao, Ye, & Guo, Haizhong. Giant photoinduced lattice distortion in oxygen vacancy ordered SrCoO2.5 thin films. United States. doi:10.1103/PhysRevB.100.144201.
Zhang, Bingbing, He, Xu, Zhao, Jiali, Yu, Can, Wen, Haidan, Meng, Sheng, Bousquet, Eric, Li, Yuelin, Jin, Kuijuan, Tao, Ye, and Guo, Haizhong. Wed . "Giant photoinduced lattice distortion in oxygen vacancy ordered SrCoO2.5 thin films". United States. doi:10.1103/PhysRevB.100.144201.
@article{osti_1576749,
title = {Giant photoinduced lattice distortion in oxygen vacancy ordered SrCoO2.5 thin films},
author = {Zhang, Bingbing and He, Xu and Zhao, Jiali and Yu, Can and Wen, Haidan and Meng, Sheng and Bousquet, Eric and Li, Yuelin and Jin, Kuijuan and Tao, Ye and Guo, Haizhong},
abstractNote = {Despite the progress in understanding the formation and migration of oxygen vacancies in strongly correlated complex oxides, few studies focused on the dynamic behaviors of the oxygen vacancies under the transient and non-equilibrium states. Here we report a series of multi-timescale ultrafast X-ray diffraction experiments using picosecond synchrotron and femtosecond table-top X-ray sources to monitor the structural dynamics in oxygen-vacancy-ordered SrCoO2.5 thin films excited by photons. A giant photoinduced structure distortion in c-axis direction (with strain Δc/c > 1 {%}) was observed, higher than any previously reported data in the other transition metal oxide films. The femtosecond X-ray diffraction reveals the formation and propagation of the coherent acoustic phonons, indicating an instantaneous and a much larger photoinduced stress within the first 100 ps. Density Function Theory reproduced the photostrictive responses and the strong dependence on excitation wavelength as observed in the experiment. The combined experimental and theoretic results demonstrate that the photoexcitation of bonding to antibonding state via charge transfer is the dominant mechanism in the SrCoO2.5 thin films distinct from the depolarization effect by photoinduced carriers in the other perovskite oxides.},
doi = {10.1103/PhysRevB.100.144201},
journal = {Physical Review, B: Condensed Matter},
number = 14,
volume = 100,
place = {United States},
year = {2019},
month = {10}
}

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