Growth Mode Transition in Complex Oxide Heteroepitaxy: Atomically Resolved Studies
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- 作者：Alexander Tselev ; Rama K. Vasudevan ; Anthony G. Gianfrancesco ; Liang Qiao ; Tricia L. Meyer ; Ho Nyung Lee ; Michael D. Biegalski ; Arthur P. Baddorf ; Sergei V. Kalinin
- 刊名：Crystal Growth & Design
- 出版年：2016
- 出版时间：May 4, 2016
- 年：2016
- 卷：16
- 期：5
- 页码：2708-2716
- 全文大小：567K
- 年卷期：0
- ISSN：1528-7505
文摘
We performed investigations of the atomic-scale surface structure of epitaxial La5/8Ca3/8MnO3 thin films as a model system dependent on growth conditions in pulsed laser deposition with emphasis on film growth kinetics. Postdeposition in situ scanning tunneling microscopy was combined with in operando reflective high-energy electron diffraction to monitor the film growth and ex situ X-ray diffraction for structural analysis. We find a correlation between the out-of-plane lattice parameter and both adspecies mobility and height of the Ehrlich–Schwoebel barrier, with mobility of adatoms greater over the cationically stoichiometric terminations. The data suggest that the out-of-plane lattice parameter is dependent on the mechanism of epitaxial strain relaxation, which is controlled by the oxidative power of the deposition environment.