Percolative transition and scaling of transport E-J characteristics in YBCO coated IBAD tape
Percolative transition and scaling of transport E-J characteristics in YBCO coated IBAD tape
复制标题
YBCO 涂层 IBAD 带中传输 E-J 特性的渗透转变和缩放
DOI：
10.1109/tasc.2003.811906
复制
发表时间：
2003
影响因子：
1.8
通讯作者：
Y. Shiohara
中科院分区：
文献类型：
--
作者：
T. Kiss;M. Inoue;S. Egashira;T. Kuga;M. Ishimaru;M. Takeo;T. Matsushita;Y. Iijima;K. Kakimoto;T. Saitoh;S. Awaji;Kazuo Watanabe;Y. Shiohara
我们研究了YBCO涂层IBAD带材的扩展电场-电流密度E-J特性。用蒙特卡罗方法研究了随机针状介质中的脱钉现象，并与测量结果进行了比较。利用低温扫描激光显微镜研究了YBCO带材的局域电阻转变的渗流行为。结果还表明，脱钉概率与E-J曲线的动态电阻成正比，并借助于功率指数将脱钉概率作为减小的电流密度的函数来表示。因此，带材的E-J特性可以用两种标度律的组合来描述：一种是随机网络中预测的脱钉扎概率的标度律，另一种是磁通钉扎力的标度律。这些性质与脱宾团簇的渗流模型符合得很好。
We have investigated extended electric field-vs.-current density E-J characteristics in YBCO coated IBAD tapes. The results of a Monte-Carlo study on the depinning in a random pin medium were compared with measurements. Using a low temperature scanning laser microscope, we examined the percolative behavior of the local resistive transition in the YBCO tape. It was also shown that the depinning probability, which is proportional to the dynamic resistance of the E-J curves, is scaled as a function of reduced current density with the aid of a power index. Consequently, the E-J characteristics in the tapes can be described by the combination of the two kinds of scaling laws: one is the scaling law of the depinning probability predicted in a random network and the other is the scaling law for the flux pinning force. These properties agree well with the percolation model of depinned clusters.