Evaluation of Magnetic Field Dependence of the Interface Resistivity in REBCO Tape
Evaluation of Magnetic Field Dependence of the Interface Resistivity in REBCO Tape
复制标题
REBCO 胶带界面电阻率的磁场依赖性评估
DOI：
10.1109/tasc.2022.3186268
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发表时间：
2022
影响因子：
1.8
通讯作者：
Hidetoshi Hashizume
中科院分区：
文献类型：
--
作者：
Yosuke Atake; Satoshi Ito;Kohki Takahashi;Hidetoshi Hashizume
由于REBCO带具有多层结构，REBCO/Ag和Ag/Cu界面的电阻（界面电阻）是带对带搭接接头的接头电阻的主要因素之一。由于界面电阻根据制造商和卷带的批次而变化很大，因此详细研究界面电阻对于带对带接合技术是重要的。在我们之前的研究中，接触探测电流传输长度（CTL）方法被提出作为一种非破坏性的方法来评估界面电阻率。在10 ~ 70 K和0 ~ 15 T范围内，研究了REBCO超导带材界面电阻率随磁场和温度的变化规律。首先，进行了数值模拟，以获得校准曲线，显示CTL和界面电阻率之间的关系。然后，在每个温度和磁场下实验测量CTL。通过比较校准曲线和实验测量的CTL，得到界面电阻率。结果表明，在40 K以下，界面电阻率随磁场的增大而减小.另一方面，在50 K以上，它变为恒定或增加。在自场下，界面电阻率随温度的升高而减小。这些行为与金属的电阻行为不同，因此，REBCO在界面附近的性质可能对整个界面电阻率有很大的影响。
As a result of REBCO tape having a multi-layered structure, electrical resistance of REBCO/Ag and Ag/Cu interfaces (interface resistance) is one of the major factors of joint resistance for tape-to-tape lap joints. Since the interface resistance widely varies depending on the manufacturers and the spool batches of the tapes, detailed study of the interface resistance is important for tape-to-tape joint technology. In our previous study, the contact-probing current transfer length (CTL) method was proposed as a nondestructive method to evaluate the interface resistivity. In this paper, the authors evaluated the magnetic field and temperature dependences of the interface resistivity of REBCO tapes in the range of 10 to 70 K and 0 to 15 T. First, a numerical simulation was conducted to obtain the calibration curves which show the relationship between the CTL and the interface resistivity. Then, the CTL was experimentally measured at each temperature and magnetic field. The interface resistivity was derived by comparing the calibration curves and the experimentally measured CTLs. As a result, the interface resistivity decreased with increasing magnetic field below 40 K. On the other hand, it changed to become constant or increase over 50 K. Furthermore, the interface resistivity decreased with an increase in temperature at self-field. These behaviors are different from those of the resistance for metals, therefore, REBCO's properties near the interface may have a huge influence on the whole interface resistivity.