Enhancement of the transport properties in α-axis oriented YBa/sub 2/Cu/sub 3/O//sub 7-γ/ thin films by calcium doping
| Autor: | Johannes D. Pedarnig, A. Vostner, D. Bauerle, M. P. Delamare, H. W. Weber, S. Tonies |
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| Rok vydání: | 2003 |
| Předmět: |
High-temperature superconductivity
Materials science Condensed matter physics Doping Condensed Matter Physics Electronic Optical and Magnetic Materials Magnetic field law.invention Electrical resistivity and conductivity law Grain boundary Irradiation Electrical and Electronic Engineering Thin film Layer (electronics) |
| Zdroj: | IEEE Transactions on Appiled Superconductivity. 13:2890-2893 |
| ISSN: | 1051-8223 |
| DOI: | 10.1109/tasc.2003.812036 |
| Popis: | High critical current densities (J/sub c/) are required for applications, but grain boundaries suppress the attainable J/sub c/ values. Because of the presence of 90/spl deg/ grain boundaries and because of poor structural and electrical properties, a-axis thin films are of great interest to investigate the role played by Y/sub 0.8/Ca/sub 0.2/Ba/sub 2/Cu/sub 3/O/sub 7-/spl delta// (YCaBCO) cap layers in the transport properties. The transport critical current densities of the films under various magnetic fields and the angular dependence of J/sub c/ at fixed temperature were measured before and after irradiation. A thin YCaBCO cap layer deposited on top of a-axis oriented YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// (YBCO) films, is found to improve the electrical transport properties. Ca-doping decreases the resistivity and strongly increases J/sub c/ of a-axis oriented YBCO films. Furthermore, strong pinning by 90/spl deg/ grain boundaries was observed. |
| Databáze: | OpenAIRE |
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