Joule heating and high frequency nonlinear effects in the surface impedance of high Tc superconductors

Details Joule heating and high frequency nonlinear effects in the surface impedance of high Tc superconductors Joule heating and high frequency nonlinear effects in the surface impedance of high Tc superconductors

2009-09-23

arxiv.org/abs/0909.4206v1

Physics

Condensed Matter

Superconductivity

Scientific paper

Using the dielectric resonator method, we have investigated nonlinearities in the surface impedance Zs = Rs + jXs of YBa2Cu3O7 thin films at 10 GHz as function of the incident microwave power level and temperature. The use of a rutile dielectric resonator allows us to measure the precise temperature of the films. We conclusively show that the usually observed increase of the surface resistance of YBa2Cu3O7 thin film as function of microwave power is due to local heating.

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