AC susceptibility of a monofilament Bi-2223/Ag superconducting tape in a perpendicular field

Measurements and calculations are presented of the real ( χ′) and imaginary ( χ″) parts of the AC susceptibility of a monofilament silver-sheathed Bi-2223 tape as a function of temperature T=4–130 K, frequency ω/2 π=5 Hz–5 kHz and ac magnetic field amplitude μ 0 H m=0.02–7 mT. The susceptibilities c...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 1999-03, Vol.314 (3), p.183-188
Main Authors: Savvides, Nick, Müller, Karl-Heinz
Format: Article
Language:English
Subjects:
AC loss
AC susceptibility
Eddy current loss
Superconductors
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Summary:Measurements and calculations are presented of the real ( χ′) and imaginary ( χ″) parts of the AC susceptibility of a monofilament silver-sheathed Bi-2223 tape as a function of temperature T=4–130 K, frequency ω/2 π=5 Hz–5 kHz and ac magnetic field amplitude μ 0 H m=0.02–7 mT. The susceptibilities consist of a hysteretic component due to induced currents in the superconductor core and an eddy current component due to induced eddy currents in the silver sheath. At high temperatures (>70 K) the low frequency limit is used to rigorously calculate the hysteretic and eddy current susceptibilities while at low temperatures the susceptibility is approximately described as being due to eddy currents flowing along the edges of the tape. The measured χ″ and hence AC loss at low frequencies (
ISSN:0921-4534
1873-2143
DOI:10.1016/S0921-4534(99)00173-2