Thermally-induced nonlinearities in the surface impedance of superconducting YBCO thin films

  title={Thermally-induced nonlinearities in the surface impedance of superconducting YBCO thin films},
  author={Jarek Wosik and L. Xie and J. Miller and S. A. Long and K. Nesteruk},
  journal={IEEE Transactions on Applied Superconductivity},
We have measured the microwave power dependence of the surface impedance Z/sub g/ of YBa/sub 2/Cu/sub 3/O/sub x/ (YBCO) thin films up to very high microwave power levels. Experiments have been performed, using both frequency and pulsed time domain techniques, in a 14 GHz TE/sub 011/ dielectric cavity. Our results demonstrate that heating of the superconducting film by the applied RF field contributes significantly to the nonlinearity of the measured surface resistance at high input power levels… CONTINUE READING


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