Ac susceptibility of a coated conductor with high-temperature superconducting film and covered copper stabilizer

作者：Chen D X^*

来源：Physica C-Superconductivity and Its Applications, 2014, 502: 47-52.

DOI：10.1016/j.physc.2014.04.033

• Ac susceptibility
• Superconducting film
• Eddy-currents

The ac susceptibility, chi = chi' - j chi '', of a nearly square sample, cut from a coated conductor tape consisting of a high-temperature superconducting film and a covered copper stabilizer, is measured as a function of temperature, T, at several values of frequency, f. It is found that the chi(f) at T > Tc can be well simulated by a modeling eddy-current susceptibility of the stabilizer, and there is an extra low-T stage, where chi is not constant as expected and may be separated into two parts. The T-independent part is contributed by Meissner currents in the film with over-low vertical bar chi'vertical bar, indicating that the film edge was damaged by cutting during tape and sample preparation. The T-dependent part is contributed by both eddy-currents and supercurrents, having a special f dependence with unknown mechanism. Both currents are interacted to each other in a complex way in the T range below and near T-c, resulting in interesting features in chi(T,f).

• 出版日期2014-7-15