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Microwave power handling in engineered YBa2Cu3O7-δ grain boundaries

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Microwave-frequency (rf) power-dependence measurements performed on thin-film YBa2Cu3O7-δ grain boundaries engineered on sapphire bicrystal substrates with misorientation angles of θ=2°, 5°, 10°, and 24° are presented. The data are compared to measurements on films grown on single-crystal substrates. A stripline-resonator measurement technique is employed. The rf results are compared to dc measurements performed on a four-point test structure on the same substrate as the resonator. The measurements demonstrate that low-angle grain boundaries (θ≤10°) have little effect on the rf power handling, while the high-angle grain boundaries (θ=24°) cause large nonlinear losses due to Josephson vortices created by rf currents. © 1998 American Institute of Physics.

Published in:

Applied Physics Letters  (Volume:73 ,  Issue: 15 )

Date of Publication:

Oct 1998

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