Spatially resolved measurements of critical parameters in superconducting filaments by laser scanning technique
Spatially resolved measurements of critical parameters in superconducting filaments by laser scanning technique
复制标题
通过激光扫描技术对超导丝中的关键参数进行空间分辨测量
DOI：
10.1109/77.919736
复制
发表时间：
2001
影响因子：
1.8
通讯作者：
A. V. Ustinov
中科院分区：
文献类型：
--
作者：
D. Abraimov;A. Sivakov;A. Lukashenko;M. Fistul;P. Müller;A. V. Ustinov
利用低温扫描激光显微镜（LTSLM）对超导细丝的局域输运性质进行了实验研究。提出了一种新的理论模型，处理激光束感生电压响应，并应用于分析测量数据。LTSLM方法允许可视化从（Bi，Pb）/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub 10+x//Ag带中提取的单个细丝中的局部不均匀性。使用所提出的理论分析，我们提取的空间分布的临界电流和临界温度的样品。由LTLSM获得的瓷砖数据显示出良好的协议与标准的非本地传输测量。使用自相关分析的电压响应，检索的特征长度的临界电流变化的灯丝属于不同部分的磁带。
We present an experimental study of local transport properties of superconducting filaments by means of low temperature scanning laser microscopy (LTSLM). A novel theoretical model that treats the laser-beam-induced voltage response is proposed and applied to analyze the measured data. The method of LTSLM allows to visualize the local inhomogeneities in individual filaments extracted from (Bi,Pb)/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub 10+x//Ag tapes. Using the proposed theoretical analysis we extract the spatial distributions of the critical currents and critical temperatures over the sample. Tile data obtained by LTLSM show good agreement with standard non-local transport measurements. Using autocorrelation analysis of the voltage response, the characteristic length of the critical current variation is retrieved for filaments that belong to different parts of the tape.