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Temperature dependence of surface impedance of pulsed-laser-deposited YBCO films

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4 Author(s)
Clark, J.H. ; Strathclyde Univ., Glasgow, UK ; Donaldson, G.B. ; Gallop, J.C. ; Bowman, R.M.

One promising application of HTS materials is as the reference resonator element for a stable frequency source. A high Q superconducting resonator operated at low reduced temperature (T/T/sub c//spl Lt/1) should offer excellent frequency stability due to its low temperature coefficient of resonant frequency. HTS planar resonators appear to be particularly promising since a reduced temperature of 0.1 may be readily achieved with a closed-cycle cryocooler. We report here microwave measurements made on YBCO films grown by pulsed laser deposition (PLD), using both a Nb cavity and a parallel-plate resonator configuration, with particular emphasis on the variation of resonant frequeney with temperature. We compare the data with simple theoretical models and find evidence from the low temperature data for a low energy gap parameter /spl Delta/(0)=6 meV. Some predictions of attainable frequency stability of planar resonator structures are also made.<>

Published in:

Applied Superconductivity, IEEE Transactions on  (Volume:5 ,  Issue: 2 )

Date of Publication:

June 1995

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