In Situ Oxidation of Superconducting YBCO Films by a Supersonic ${\rm O}_{2}$ Beam
| Autor: | S. Rampino, M. Bindi, Mario Rocca, Edmondo Gilioli, S. Zannella, S. Ginocchio, Andrea Gauzzi, M. Baldini |
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| Rok vydání: | 2007 |
| Předmět: |
Materials science
High-temperature superconductivity Fabrication Coated conductors business.industry Yttrium barium copper oxide Condensed Matter Physics Electronic Optical and Magnetic Materials law.invention Film oxidation chemistry.chemical_compound Supersonic beams chemistry law Deposition (phase transition) Optoelectronics Supersonic speed Electrical and Electronic Engineering business Electrical conductor Molecular beam Beam (structure) Superconducting films |
| Zdroj: | IEEE transactions on applied superconductivity 17 (2007): 3286–3289. doi:10.1109/TASC.2007.898932 info:cnr-pdr/source/autori:Rampino S. a; Gauzzi A. ab; Baldini M. c; Bindi M. c; Gilioli E. a; Ginocchio S. c; Rocca M. de; Zannella S. c/titolo:In situ oxidation of superconducting YBCO films by a supersonic O-2 beam/doi:10.1109%2FTASC.2007.898932/rivista:IEEE transactions on applied superconductivity (Print)/anno:2007/pagina_da:3286/pagina_a:3289/intervallo_pagine:3286–3289/volume:17 |
| ISSN: | 1051-8223 |
| Popis: | We report on the successful implementation of a supersonic molecular oxygen (O 2) beam for the in situ oxidation of superconducting YBCO films. The beam is produced by a specially designed array of conical nozzles that were laser machined in a platinum foil. The array was mounted in proximity of the deposition area of a thermal co-evaporation system for YBCO film deposition. After a brief description of the basic concepts underlying the physics of supersonic beams, we describe the design of the nozzle implemented in our system. Then, we illustrate and discuss the preliminary results obtained by varying a number of key parameters of the supersonic beam. Most Important parameters turn out to be the input O 2 pressure and the nozzle-film distance. We show that excellent electrical properties with zero-resistance superconducting critical temperatures, T c, in excess of 90 K are reproducibly obtained over the entire 20 cm × 20 cm deposition area. These results were obtained using various types of substrates relevant to coated conductor fabrication, including Zr-doped CeO 2 buffered cube-textured Ni-W and MgO buffered hastelloy substrates. |
| Databáze: | OpenAIRE |
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