Title :
Low-frequency AC susceptibility due to the interplay of loss mechanisms in HTS
Author :
Wei Wang ; Qi, Zhi ; Yu Wang ; Li, Chuanyi ; Chen, Kaixuan ; Lu, Guo ; Yin, Daole ; Xiao, Liye ; Lin, Liangzhen ; Song, Naihao
Author_Institution :
Dept. of Phys., Beijing Univ., China
fDate :
3/1/2001 12:00:00 AM
Abstract :
The analysis of low-frequency ac susceptibility is complicated because the hysteretic losses due to pinning and the eddy-current losses are not simply additive. We show that the electromagnetic response of both ideal and nonideal type-II superconductors can be well described with a common nonlinear response function. This function makes a consistent description of the crossover from the power-law E(J) of flux-creep to the ohmic flux-flow regime. We interpret the scaling behavior of ac susceptibility with this nonlinear equation
Keywords :
eddy current losses; flux creep; flux flow; high-temperature superconductors; magnetic hysteresis; magnetic susceptibility; eddy-current losses; electromagnetic response; flux-creep; hysteretic losses; loss mechanisms; low-frequency AC susceptibility; nonlinear response function; ohmic flux-flow regime; scaling behavior; type-II superconductors; Bean model; Critical current; High temperature superconductors; Hysteresis; Maxwell equations; Nonlinear equations; Superconducting materials; Superconductivity; Temperature dependence; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
