rf impedance of sintered BSCCO and melt-textured YBCO superconductors

The authors present the temperature and field dependence of radio frequency response of sintered BSCCO 110-K phase and melt-textured YBCO with Ag and 211 inclusions. The rf resistance and reactance measurements are carried out using a marginal oscillator operating at 11.9 MHz. Melt-textured samples...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 1999-09, Vol.9 (3), p.4624-4627
Main Authors: Parimi, P.V., Vummethala, S.B.
Format: Article
Language:English
Subjects:
Applied sciences
Bismuth compounds
BISMUTH OXIDE
Condensed matter: electronic structure, electrical, magnetic, and optical properties
COPPER OXIDE
Electromagnetic wave absorption
Electronics
Exact sciences and technology
Frequency measurement
High temperature superconductors
IMPEDANCE
Links
Magnetic field measurement
Oscillators
Penetration depth
Physics
Properties of type I and type II superconductors
Radio frequencies
Radio frequency
Reactance
Response to electromagnetic fields (nuclear magnetic resonance, surface impedance, etc.)
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
SINTERING
Superconducting devices
SUPERCONDUCTIVITY
SUPERCONDUCTORS
YBCO superconductors
Yttrium barium copper oxide
YTTRIUM OXIDE
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Summary:The authors present the temperature and field dependence of radio frequency response of sintered BSCCO 110-K phase and melt-textured YBCO with Ag and 211 inclusions. The rf resistance and reactance measurements are carried out using a marginal oscillator operating at 11.9 MHz. Melt-textured samples are found to exhibit insignificant low-field losses and hence are potential candidates for applications at radio frequencies. The field induced loss in sintered BSCCO is described by invoking two kinds of weak links. The rf penetration depth of the materials measured is found to be much larger than the London penetration depth and represents the effective screen depth. More importantly, the authors observed an anomaly in the penetration depth of BSCCO which is explained in terms of an interplay between intragranular and Josephson penetration depths.
ISSN:1051-8223
1558-2515
DOI:10.1109/77.791919