Small angle electron diffraction and Foucault mode Lorentz microscopy of superconducting vortex lattice
Small angle electron diffraction and Foucault mode Lorentz microscopy of superconducting vortex lattice
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超导涡旋晶格的小角电子衍射和傅科模式洛伦兹显微镜
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
G. Pozzi
中科院分区：
文献类型：
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作者：
Takaho Yoshida;H. Kasai;K. Harada;N. Osakabe;T. Tonomura;G. Pozzi
用场发射透射电子显微镜观察了Nb薄膜中涡旋晶格的小角电子衍射花样。在高达1000 G的磁场中，从直径为（1-10）μm的选定区域和（1-30）s内获得衍射图案是可能的。从衍射图样的精细结构确定涡旋晶格的有序度。我们还证明了福柯模式洛伦兹显微镜通过使用衍射技术。在聚焦显微照片中，通过衍射对比出现涡流，因此同时观察到涡流和材料缺陷。
Small angle electron diffraction patterns from vortex lattices in Nb thin films were observed using a field emission transmission electron microscope. It was possible to obtain diffraction patterns in magnetic fields of up to 1000 G, from selected areas of (1–10) μm in diameter, and in (1–30) s. The degree of order of the vortex lattice was determined from the fine structure of the diffraction pattern. We also demonstrated Foucault mode Lorentz microscopy by using a diffraction technique. Vortices appeared by diffraction contrast in a focused micrograph, and therefore both vortices and material defects were simultaneously observed.