Scanning SQUID microscopy of sparsely twinned YBa 2 Cu 3 O 7-δ
Scanning SQUID microscopy of sparsely twinned YBa 2 Cu 3 O 7-δ
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稀疏孪晶 YBa 2 Cu 3 O 7-δ 的扫描 SQUID 显微镜
DOI：
10.1103/physrevb.55.12753
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发表时间：
1997
影响因子：
3.7
通讯作者：
W. Hardy
中科院分区：
文献类型：
--
作者：
K. Moler;J. Kirtley;R. Liang;D. Bonn;W. Hardy
用扫描SQUID显微镜在低外加磁场（H a< 100 mG）下拍摄了两个稀疏孪晶YBa 2 Cu 3 O 7−δ单晶的磁像。SQUID传感器具有4或8 μm拾取回路，在正常工作条件下磁通分辨率为10−3 hc/2e。图像显示迈斯纳筛选具有较大的消磁因子和孤立的捕获涡。捕获的涡旋携带积分（hc/2e）磁通量，且远小于传感器的空间分辨率。在这个分辨率水平上，没有证据表明不寻常的磁性特征，如分数涡旋，与孪生边界有关。
Magnetic images of two sparsely twinned YBa 2 Cu 3 O 7− δ single crystals were taken in low applied magnetic fields (H a< 100 mG) with a scanning SQUID microscope. The SQUID sensors have 4 or 8 μm pickup loops and a magnetic flux resolution of 10− 3 hc/2e under normal operating conditions. The images showed Meissner screening with a large demagnetization factor and isolated trapped vortices. The trapped vortices carried integral (hc/2e) magnetic flux and were much smaller than the spatial resolution of the sensor. At this level of resolution, there was no evidence for unusual magnetic features, such as fractional vortices, associated with the twin boundaries.