Influence of oxygen pressure and aging on LaAlO{sub 3} films grown by pulsed laser deposition on SrTiO{sub 3} substrates

Journal Article · Mon Feb 24 04:00:00 EST 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4866439· OSTI ID:22293096

Park, Jihwey; Aeppli, Gabriel ^[1]; Soh, Yeong-Ah ^[1]; David, Adrian; Lin, Weinan ^[2]; Wu, Tom ^[3]

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1. London Centre for Nanotechnology, University College London, London WC1H 0AH (United Kingdom)
2. Division of Physics and Applied Physics, Nanyang Technological University, Singapore 637371 (Singapore)
3. Physical Sciences and Engineering Division, King Abdullah University of Science and Technology, Thuwal 23955-6900 (Saudi Arabia)

The crystal structures of LaAlO{sub 3} films grown by pulsed laser deposition on SrTiO{sub 3} substrates at oxygen pressure of 10{sup −3} millibars or 10{sup −5} millibars, where kinetics of ablated species hardly depend on oxygen background pressure, are compared. Our results show that the interface between LaAlO{sub 3} and SrTiO{sub 3} is sharper when the oxygen pressure is lower. Over time, the formation of various crystalline phases is observed while the crystalline thickness of the LaAlO{sub 3} layer remains unchanged. X-ray scattering as well as atomic force microscopy measurements indicate three-dimensional growth of such phases, which appear to be fed from an amorphous capping layer present in as-grown samples.

• OSTI ID: 22293096
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 8 Vol. 104; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALUMINATES
ATOMIC FORCE MICROSCOPY
CRYSTAL GROWTH
CRYSTAL STRUCTURE
ENERGY BEAM DEPOSITION
INTERFACES
LANTHANUM COMPOUNDS
LASER RADIATION
OXYGEN
PULSED IRRADIATION
STRONTIUM TITANATES
THIN FILMS
X-RAY DIFFRACTION