Microwave Loss Measurements on YBCO Films Using a Stripline Resonator
Thin films of YBa2Cu3O7 were deposited by rf magnetron sputtering onto heated substrates, and were superconducting without a subsequent anneal. Several of these films were placed as ground planes in a stripline resonator in a temperature-controlled cryostat. The frequency dependence of the reflection coefficient was measured up to 3 GHz using a network analyzer. From the quality factor Q of the resonances, the microwave surface resistance RS of the superconducting films was determined over a range of temperatures. For a YBCO film on (100) LaGaO3, RS(2 GHz) was less than 3 mΩ for T<40K.
KeywordsReflection Coefficient Ground Plane YBCO Film Conductor Loss Center Strip
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