Surface roughening associated with ∼140 °C transition of a LaGaO3 substrate for high T c superconducting films
- 20 November 1989
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 55 (21) , 2230-2232
- https://doi.org/10.1063/1.102354
Abstract
A ferroelastic‐like transition at ∼140 °C in a single‐crystal LaGaO3 substrate was directly observed with an optical microscope at elevated temperatures. In addition, it was found for the first time that a polished surface morphology of a pseudocubic (001) LaGaO3 substrate degraded after a heat cycle up to only 200 °C. This surface degradation, i.e., surface roughening, is associated with the transition at ∼140 °C, and it may possibly be the major origin of relatively low critical current density reported for a superconducting YBa2Cu3Ox film grown on a LaGaO3 substrate.Keywords
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