Microwave complex conductivity of the YBCO thin films as a function of static external magnetic field

A sapphire rod resonator operating at microwave frequencies was used to determine the electric properties of 600 nm thick YBCO films in the superconducting state. The rigorous electromagnetic modelling was applied to transform the measured Q-factor and the resonant frequency to the complex conductiv...

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Bibliographic Details
Published in:Applied physics letters 2014-03, Vol.104 (10)
Main Authors: Krupka, J., Judek, J., Jastrzębski, C., Ciuk, T., Wosik, J., Zdrojek, M.
Format: Article
Language:English
Subjects:
Applied physics
Electric properties
Energy absorption
Hysteresis
Magnetic fields
Microwave frequencies
Resonant frequencies
Sapphire
Temperature dependence
Thick films
Thin films
YBCO superconductors
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Summary:A sapphire rod resonator operating at microwave frequencies was used to determine the electric properties of 600 nm thick YBCO films in the superconducting state. The rigorous electromagnetic modelling was applied to transform the measured Q-factor and the resonant frequency to the complex conductivity of high accuracy, which was previously shown to describe the intrinsic properties of superconductor thin films in more precise manner than the complex impedance. Static external magnetic field induces typical transition to normal state due to introduction of magnetic vortices into the sample. Observed magnetic hysteresis has the origin in the strong temperature dependent pinning. Additional energy absorption at about 1.5 T was observed.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4868305