Thin film Ba sub(0.6)K sub(0.4)BiO sub(3) microwave devices

Thin film Ba sub(0.6)K sub(0.4)BiO sub(3) microwave devices

We have fabricated and tested microwave structures utilizing superconducting thin films of Ba sub(0.6)K sub(0.4)BiO sub(3) (BKBO). A high quality BKBO thin film (T sub(c) > 28K, J sub(c) > 1MA/cm super(2)) grown by pulsed laser deposition on a (100) MgO substrate was patterned into a resonator...

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Veröffentlicht in:IEEE transactions on applied superconductivity 1993-01, Vol.3 (1), p.1559-1562
Hauptverfasser: Schweinfurth, R A, Van Harlingen, D L, Kruse, J, Laskar, J, Feng, M, Platt, C E, Teepe, M R
Format: Artikel
Sprache:eng
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Zusammenfassung:We have fabricated and tested microwave structures utilizing superconducting thin films of Ba sub(0.6)K sub(0.4)BiO sub(3) (BKBO). A high quality BKBO thin film (T sub(c) > 28K, J sub(c) > 1MA/cm super(2)) grown by pulsed laser deposition on a (100) MgO substrate was patterned into a resonator and coplanar waveguide (CPW) transmission line. The 2.5 mm coplanar transmission line had an insertion loss of -2.1dB at 20GHz and 21K. The resonator showed an unloaded Q (quality factor) of 230 at 15K and 15.8GHz. We were only able to infer that the surface impedance (R sub(s)) less than or approximate to 34m Omega at 15K, since the resonator was limited by radiation losses rather than conductor losses.
ISSN:1051-8223