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Polar phase transitions in heteroepitaxial stabilized La0.5Y0.5AlO3 thin films

Liu, Shenghua, Zhang, Chunfeng, Zhu, Mengya, He, Qian, Chakhalian, Jak, Liu, Xiaoran, Borisevich, Albina, Wang, Xiaoyong and Xiao, Min 2017. Polar phase transitions in heteroepitaxial stabilized La0.5Y0.5AlO3 thin films. Journal of Physics: Condensed Matter 29 (40) , 405401. 10.1088/1361-648X/aa81ea

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PAPER Polar phase transitions in heteroepitaxial stabilized La0.5Y0.5AlO3 thin films Shenghua Liu1, Chunfeng Zhang1, Mengya Zhu1, Qian He2, Jak Chakhalian3, Xiaoran Liu3,4, Albina Borisevich2, Xiaoyong Wang1 and Min Xiao1,4 Published 1 September 2017 • © 2017 IOP Publishing Ltd Journal of Physics: Condensed Matter, Volume 29, Number 40 Article PDF Figures References PDF 18 Total downloads Turn on MathJax Get permission to re-use this article Share this article Article information Abstract We report on the fabrication of epitaxial La0.5Y0.5AlO3 ultrathin films on (001) LaAlO3 substrates. Structural characterizations by scanning transmission electron microscopy and x-ray diffraction confirm the high quality of the film with a − b + c − AlO6 octahedral tilt pattern. Unlike either of the nonpolar parent compound, LaAlO3 and YAlO3, second harmonic generation measurements on the thin films suggest a nonpolar–polar phase transition at T c near 500 K, and a polar–polar phase transition at T a near 160 K. By fitting the angular dependence of the second harmonic intensities, we further propose that the two polar structures can be assigned to the Pmc2 1 and Pmn2 1 space group, while the high temperature nonpolar structure belongs to the Pbnm space group.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Cardiff Catalysis Institute (CCI)
Publisher: IOP Publishing
ISSN: 0953-8984
Date of First Compliant Deposit: 12 September 2017
Date of Acceptance: 25 July 2017
Last Modified: 10 Mar 2020 17:24

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