Deduction of the Experimental Surface Impedance of YBCO Thin Films Using a Self-Consistent Calculation

Author: Ghamlouche H.  

Publisher: Springer Publishing Company

ISSN: 0896-1107

Source: Journal of Superconductivity: Incorporating Novel Magnetism, Vol.17, Iss.2, 2004-04, pp. : 275-281

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Abstract

Measurement of surface impedance of double sided microstrip line resonator patterned out of thin film YBCO has been carried out as a function of temperature and power (restricted to linear regime). New model of the current density distribution has been used in order to extract the real and imaginary parts of the surface impedance. This model is based on a sound physical theory rather than a phenomenological one. The introduction of the critical current density in this model has a great influence on the determination of the microwave loss mechanisms along the transmission lines. Several propagation quantities have been extracted using the above mentioned model. Using this model and an iteration method to determine the RF magnetic field, we were able to reproduce our experimental results of the quality factor and then determine the corresponding surface impedance as well as the kinetic inductance and the shift in the effective dielectric constant as a function of temperature.