Journal
ACTA MATERIALIA
Volume 56, Issue 18, Pages 5312-5321Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2008.07.010
Keywords
Dislocation; Fracture; Multilayer thin films; Perovskites; Laser deposition
Funding
- US National Science Foundation [DMR-07-05054, DMR-05-20020]
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Tensile and compressive solid-solution thin films based on LaAlO3 and CaZrO3 compositions were grown on perovskite oxide substrates using pulsed laser deposition to study growth mode transitions and strain relaxation. A buried layer of SrRuO3 between the thin film and the SrTiO3 substrate was also introduced to provide an auxiliary embedded strain gauge, which helps identify the critical conditions for the onset of catastrophic strain relaxation events - cracking and dislocation cascades. The results are compared with theoretical predictions to provide guidelines on some general deposition conditions that may be used to obtain smooth, crystalline and defect-free thin films of interest to perovskite-based heterostructures. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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