Coaxial line configuration for microwave power transmission study of YBa/sub 2/Cu/sub 3/O/sub 7- delta / thin films

Microwave transmission measurements through YBa/sub 2/Cu/sub 3/O/sub 7- delta / (YBCO) high-transition-temperature superconducting thin films on lanthanum aluminate (LaAlO/sub 3/) have been performed in a coaxial line at 10 GHz. LaAlO/sub 3/ substrates were ultrasonically machined into washer-shaped discs, polished, and coated with laser-ablated YBCO. These samples were mounted in a 50- Omega coaxial air line to form a short circuit. The power transmitted through the films as a function of temperature was used to calculate the normal state conductivity and the magnetic penetration depth for the films.<
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