Temperature scaling of ac loss in YBCO superconducting tapes fabricated by the IBAD-PLD technique
Temperature scaling of ac loss in YBCO superconducting tapes fabricated by the IBAD-PLD technique
复制标题
IBAD-PLD 技术制造的 YBCO 超导带中交流损耗的温标
DOI：
10.1088/0953-2048/19/4/018
复制
发表时间：
2006
影响因子：
3.6
通讯作者：
Y. Shiohara
中科院分区：
文献类型：
--
作者：
M. Iwakuma;M. Nigo;D. Inoue;Naoya Miyamoto;K. Funaki;Y. Iijima;T. Saitoh;Y. Yamada;T. Izumi;Y. Shiohara
研究了用IBAD-PLD技术制备的YBCO超导带材交流损耗随温度的变化。交流损耗是用一个马鞍形的拾波线圈通过施加垂直于宽表面的磁场来测量的。临界电流，Ic，与磁场，B，特性的温度依赖性估计从所观察到的磁化曲线。通过将B B（T）定义为在相应温度T下对数标度的Ic-B曲线的转折点处的B的特定值，对于0≤B<B B，Ic几乎是恒定的，与B无关，并且对于B> B B的Ic与B的（1-γ）次方成比例地减小，其中γ是Irie-Yamafuji模型的pin参数，并且0<γ<1。此外，Bb和零场Ic的温度依赖性几乎相同，γ没有温度依赖性。我们发现，由零场Ic在相应温度下的归一化Ic-B曲线，Ic 0（T），与一个主曲线一致，而与温度无关。这意味着YBCO超导带材的Ic-B特性与温度成比例。因此，阐明了磁化强度和交流损耗与温度成比例。磁化曲线和交流损耗随磁场幅值的变化曲线，用Ic 0（T）归一化后，在4.2 ~ 77 K的任何温度下都与一条主曲线相吻合。这一事实在YBCO超导系统的设计中是非常有用的，因为只有当我们知道在某一温度下交流损耗的场幅度依赖性时，才有可能估计在任何温度下的交流损耗，例如，77 K，以及零场Ic的温度依赖性。
Temperature dependence of the ac loss in YBCO superconducting tapes fabricated by the IBAD-PLD technique was investigated. The ac loss was measured with a saddle-shaped pickup coil by applying a magnetic field perpendicular to the wide surface. Temperature dependence of the critical current, Ic, versus the magnetic field, B, characteristics was estimated from the magnetization curves observed. By defining Bb(T) as a specific value of B at the breaking point of the Ic–B curve in logarithmic scale at the respective temperature, T, Ic for 0≤B<Bb was nearly constant independent of B, and Ic for B>Bb decreased in proportion to the (1−γ)th power of B, where γ is a pin parameter of the Irie–Yamafuji model and 0<γ<1. In addition, the temperature dependencies of Bb and zero field Ic were almost identical and γ had no temperature dependence. We found that the normalized Ic–B curves by the zero field Ic at the respective temperature, Ic0(T), coincide with one master curve regardless of temperature. This means that the Ic–B characteristics of YBCO superconducting tapes are scaled with temperature. Consequently it was clarified that the magnetization and the ac loss are scaled with temperature. The magnetization curves and the ac loss versus field amplitude curves, which are normalized by using Ic 0(T), coincided with one master curve for any temperature from 4.2 to 77 K. This fact is very useful in the design of YBCO superconducting systems because it is possible to estimate the ac loss at any temperature only if we know the field amplitude dependence of the ac loss at some temperature, e.g., 77 K, and the temperature dependence of zero field Ic.
YBCO超导带暴露于外部交流磁场的交流损耗特性
DOI：
--
发表时间：
2005
期刊：
IEEE Trans. Appl. Supercond. Vol.15, No.2
影响因子：
--
作者：
M.Iwakuma;et al.
通讯作者：
et al.