Abstract

The quality of high-temperature superconducting thin films is dependent on the structure of the substrate used. The present work examines the effects of radiation-damaged SrTiO 3 substrates on the properties of Y 1Ba 2Cu 3O 7 thin film superconductors. Prior to film deposition, single-crystal SrTiO 3 substrates were cooled to 77 K and irradiated with 400 keV neon ions to doss of 1×10 15 and 1×10 16 ions cm −2. Following deposition the film/substrate couples were annealed in “wet” oxygen at either 850 or 900°C. Films on substrates irradiated at high doses showed an increase in transition width from 2° to 8° and lowered transition temperature from 92 to 65 K relative to films on low dose and unirradiated substrates. These differences are discussed in terms of results obtained from high-energy and Rutherford backscattering and channeling experiments, scanning electron microscopy observations and X-ray diffraction data.

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