High temperature superconductors in the radiofrequency field

High temperature superconductors in the radiofrequency field

The characterization of high T/sub c/ superconducting materials by a superregenerative radio frequency oscillator is considered. The physical principles of measurements performed on different YBa/sub 2/Cu/sub 3/O/sub 7- delta / samples are presented. A strong, reproducible and measurable effect on t...

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Bibliographic Details
Published in:IEEE transactions on magnetics Vol. 25; no. 2; pp. 2364 - 2367
Main Authors: Pirnat, J., Luznik, J., Trontelj, Z.
Format: Journal Article
Language:English
Published: IEEE 01-03-1989
Subjects:
High temperature superconductors
Magnetic circuits
Magnetic field measurement
Oscillators
Performance evaluation
Radio frequency
Shape measurement
Superconducting coils
Superconducting magnets
Superconducting materials
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Summary:The characterization of high T/sub c/ superconducting materials by a superregenerative radio frequency oscillator is considered. The physical principles of measurements performed on different YBa/sub 2/Cu/sub 3/O/sub 7- delta / samples are presented. A strong, reproducible and measurable effect on the superregenerative oscillator output was noticed when the sample in the tank circuit coil subjected to the low magnetic modulation field (about 4 mT, 25 Hz) passed through the superconductive transition in either direction. The signal is roughly independent of the spectrometer frequency from 2 MHz to 350 MHz. The results of measurements of the signal shape, the frequency shift, the line splitting and the influence of applied DC magnetic field are discussed.< >
ISSN:0018-9464
1941-0069
DOI:10.1109/20.92783