High temperature superconductors in the radiofrequency field

Author

Pirnat, J. ; Luznik, J. ; Trontelj, Z.

Author_Institution

Univ. Edvarda Kardelj of Ljubljana, Yugoslavia

Volume

25

Issue

2

fYear

1989

fDate

3/1/1989 12:00:00 AM

Firstpage

2364

Lastpage

2367

Abstract

The characterization of high T_c superconducting materials by a superregenerative radio frequency oscillator is considered. The physical principles of measurements performed on different YBa₂Cu₃O_7-δ 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

Keywords

barium compounds; high-temperature superconductors; radiofrequency spectra of inorganic solids; yttrium compounds; YBa₂Cu₃O_7-δ; applied DC magnetic field; frequency shift; high T_c superconducting materials; high temperature superconductors; line splitting; low magnetic modulation field; radiofrequency field; signal shape; superconductive transition; superregenerative radio frequency oscillator; High temperature superconductors; Magnetic circuits; Magnetic field measurement; Oscillators; Performance evaluation; Radio frequency; Shape measurement; Superconducting coils; Superconducting magnets; Superconducting materials;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.92783

Filename

92783