Frequency dependent AC loss in degraded Bi-2223/Ag tape
作者： D.-X. Chen , X.-M. Luo , J.-G. Fang , Z.-H. Han
DOI: 10.1016/S0921-4534(03)00869-4
关键词: Bar (unit) 、 Superconductivity 、 Activation energy 、 Tourbillon 、 Creep 、 Materials science 、 Vortex 、 Josephson effect 、 Condensed matter physics 、 Field dependence 、 Electrical and Electronic Engineering 、 Energy Engineering and Power Technology 、 Electronic, Optical and Magnetic Materials
摘要: Abstract The low-frequency ( f ) AC loss per cycle of a high-temperature superconducting Bi-2223/Ag tape is frequency independent when the measurements are performed at 77 K with current amplitude I m below critical c . Its vs. / consistent results derived from state model Kim type field dependent density J After sample degraded 32 to 16.5 A by repeated cooling and warming, becomes strongly it increases factor 2–3 decreasing 405 15 Hz. It found that defining an effective c1 , which 14 25 increasing Hz, Norris result for elliptic bar Bean fits data all values This behavior indicates degradation division as-obtained wide Josephson junctions into fine ones, thermally activated creep vortices formed in system leads
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