DocumentCode :
1555575
Title :
rf impedance of sintered BSCCO and melt-textured YBCO superconductors
Author :
Parimi, P.V. ; Vummethala, S.B.
Author_Institution :
Sch. of Phys., Hyderabad Univ., India
Volume :
9
Issue :
3
fYear :
1999
Firstpage :
4624
Lastpage :
4627
Abstract :
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.
Keywords :
barium compounds; bismuth compounds; calcium compounds; electric impedance; electric reactance; electric resistance; high-temperature superconductors; lead compounds; melt texturing; microwave materials; penetration depth (superconductivity); sintering; strontium compounds; yttrium compounds; 11.9 MHz; 211 inclusions; Ag addition; Bi/sub 1.2/Pb/sub 0.3/Sr/sub 1.5/Ca/sub 2/Cu/sub 3/O; Bi/sub 1.2/Pb/sub 0.3/Sr/sub 1.5/Ca/sub 2/Cu/sub 3/O/sub y/; Josephson penetration depth; London penetration depth; YBa/sub 2/Cu/sub 3/O/sub 7-y/; YBa/sub 2/Cu/sub 3/O/sub 7/; effective screen depth; field dependence; field induced loss; intragranular penetration depth; marginal oscillator; melt-textured YBCO; power absorption; radio frequency response; rf impedance; rf penetration depth; rf reactance; rf resistance; sintered BSCCO; temperature dependence; weak links; Bismuth compounds; Electromagnetic wave absorption; Frequency measurement; High temperature superconductors; Impedance; Magnetic field measurement; Oscillators; Radio frequency; Superconductivity; Yttrium barium copper oxide;
fLanguage :
English
Journal_Title :
Applied Superconductivity, IEEE Transactions on
Publisher :
ieee
ISSN :
1051-8223
Type :
jour
DOI :
10.1109/77.791919
Filename :
791919
Link To Document :
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