Journal article
Stoichiometry of LaAlO3 films grown on SrTiO3 by pulsed laser deposition
Journal of applied physics, v 114(2)
14 Jul 2013
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
We have studied the stoichiometry of epitaxial LaAlO3 thin films on SrTiO3 substrate grown by pulsed laser deposition as a function of laser energy density and oxygen pressure during the film growth. Both x-ray diffraction (theta-2 theta scan and reciprocal space mapping) and transmission electron microscopy (geometric phase analysis) revealed a change of lattice constant in the film with the distance from the substrate. Combined with composition analysis using x-ray fluorescence we found that the nominal unit-cell volume expanded when the LaAlO3 film was La-rich, but remained near the bulk value when the film was La-poor or stoichiometric. La excess was found in all the films deposited in oxygen pressures lower than 10(-2) Torr. We conclude that the discussion of LaAlO3/SrTiO3 interfacial properties should include the effects of cation off-stoichiometry in the LaAlO3 films when the deposition is conducted under low oxygen pressures. (C) 2013 AIP Publishing LLC.
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Details
- Title
- Stoichiometry of LaAlO3 films grown on SrTiO3 by pulsed laser deposition
- Creators
- M. Golalikhani - Temple Univ, Dept Phys, Philadelphia, PA 19122 USAQ. Y. Lei - Temple Univ, Dept Phys, Philadelphia, PA 19122 USAG. Chen - Drexel Univ, Dept Mat Sci & Engn, Philadelphia, PA 19104 USAJ. E. Spanier - Drexel UniversityH. Ghassemi - Drexel Univ, Dept Mat Sci & Engn, Philadelphia, PA 19104 USAC. L. Johnson - Drexel UniversityM. L. Taheri - Drexel Univ, Dept Mat Sci & Engn, Philadelphia, PA 19104 USAX. X. Xi - Temple Univ, Dept Phys, Philadelphia, PA 19122 USA
- Publication Details
- Journal of applied physics, v 114(2)
- Publisher
- American Institute of Physics
- Number of pages
- 5
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Accelerated Career Entry Bachelor of Science in Nursing (BSN); Mechanical Engineering and Mechanics
- Web of Science ID
- WOS:000321761600072
- Scopus ID
- 2-s2.0-84880375026
- Other Identifier
- 991019168465404721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Physics, Applied