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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Zaitsev, A. G. Wordenweber, R. Kutzner, R. Konigs, Th Zuccaro, C. Klein, N. |
| Copyright Year | 1996 |
| Description | Author affiliation: Institut für Schicht, und Ionentechnik, Forschungszentrum Jülich, D-52425 Jülich, Germany. (Zaitsev, A G; Wordenweber, R; Kutzner, R; Konigs, Th) || Institut für Festkörperforschung, Forschungszentrum Jülich, D-52425 Jülich, Germany. (Zuccaro, C; Klein, N) |
| Abstract | YBa2Cu3O7-x (YBCO) thin films have been prepared on 2 inch in diam. (1102) sapphire substrates buffered with CeO2 of mixed (001)/(111) orientation. The thickness of the YBCO films was typically about 250 nm. The YBCO thin films exhibited very smooth surface (peak-to peak roughness of less than 20 nm) free of cracks and outgrowths. The critical temperatures of these films were 88 - 89 K and the critical curent densities were (2-3) 106 A/cm2 at 77 K and zero field. The microwave surface resistance Rs of the YBCO films was measured at 18.7 GHz. Values of Rs - 1.4 m¿ were obtained at 77 K and Rs <70 ¿¿ below 20 K. Such low Rs values are comparable to the lowest reported values for thicker YBCO films grown epitaxially on strucually closely matched substrates. Such properties, including low Rs values, were obtained for the 4-5 months old YBCO films as well, that allows considering these films as stable with time. The possibility of obtaining films of similar high quality on large area sapphire substrates seems to be very promissing for the development of various microwave cryoelectronic devices. The fact that epitaxial high temperature superconducting YBCO thin films may exhibit microwave surface resistances far below that of copper makes these films to be very promissing for applications in the field of microwave electronics [1,2]. |
| Starting Page | 665 |
| Ending Page | 668 |
| File Size | 4808423 |
| Page Count | 4 |
| File Format | |
| DOI | 10.1109/EUMA.1996.337668 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 1996-09-06 |
| Publisher Place | Czech Republic |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Superconducting films Yttrium barium copper oxide Substrates Superconducting microwave devices Superconducting thin films Surface resistance Rough surfaces Surface roughness Surface cracks Temperature |
| Content Type | Text |
| Resource Type | Article |
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