Single and double side YBCO thin films for x-band microwave filters and devices
- Univ. di Salerno (Italy). INFM-Dipt. di Fisica; and others
The properties of high quality single side and double side YBa{sub 2}Cu{sub 2}O{sub 7{minus}{delta}} (YBCO) thin films deposited on LaAlO{sub 3} substrates by pure oxygen d.c. sputtering are reported. The single side films are highly c-axis oriented with their a (or b) axis parallel to that of the substrate. The critical temperature is higher than 91 K with transition width less than 0.5 K, while the critical current density J{sub c} is higher than 3 MA/cm{sup 2} at 77 K. The best double side samples exhibit no appreciable differences in the superconducting properties of the films deposited on the two different sides. X-ray analyses show in both cases highly c-axis oriented thin films with comparable values of the c-axis length (1.169 nm). The microwave properties are tested by a microstrip resonator technique. The surface resistance is lower than 80 {mu}{Omega} at 77 K and f = 5.4 GHz while the penetration depth at low temperature is in the range 150--200 nm.
- OSTI ID:
- 687448
- Report Number(s):
- CONF-9810174--
- Journal Information:
- International Journal of Modern Physics B, Journal Name: International Journal of Modern Physics B Journal Issue: 9-10 Vol. 13; ISSN IJPBEV; ISSN 0217-9792
- Country of Publication:
- United States
- Language:
- English
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