Thin Film Bao.6Ko.4Bi03 Microwave Devices

R. A. Schweinfurth, D. J. Van Harlingen, J. Kruse, J. Laskar, M. Feng, C. E. Platt, M. R. Teepe

Research output: Contribution to journalComment/debatepeer-review


We have fabricated and tested microwave structures utilizing superconducting thin films of Ba0.6K0.4BiO3 (BKBO). A high quality BKBO thin film (Tc > 28K, Jc > 1MA/cm2) 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 (Rs) ≤ 34mΩ at 15K, since the resonator was limited by radiation losses rather than conductor losses.

Original languageEnglish (US)
Pages (from-to)1559-1562
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Issue number1
StatePublished - Mar 1993

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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