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Journal of Electron Microscopy 47(5): 443-448 (1998)
© 1998 Oxford University Press

Observation of the interaction of vortices with dislocations in a Nb superconductor by a cryo-Lorentz EM

Marco Cantoni1, Masaya Uchida1, Yoshio Matsui1, Shunji Takekawa1, Tadamasa Tsuruta1 and Shigeo Horiuchi1,*

1National Institute for Research in Inorganic Materials Namiki 1-1, Tsukuba, Ibaraki, 305-0044, Japan

*To whom correspondence should be addressed. E-mail: horiuchi{at}nirim.go.jp

The arrangement of quantized magnetic flux lines (vortices) in a Nb superconductor was observed in different magnetic fields up to 200 Gauss by a cryo-Lorentz electron microscope. The interaction of vortices with dislocations in the specimen could directly be clarified. Edge-on dislocations, having been parallel to the vortex core, were identified to pin individual vortices effectively at magnetic fields below 100 Gauss. In higher magnetic fields the formation of a regular hexagonal vortex lattice started preferentially at in-plane dislocations. At 200 Gauss the Abrikosov vortex lattice was formed almost completely and it revealed domains of vortex lattice with slightly different orientations. The dislocations were observed in the centre part of the domains, showing their important role on the formation of the vortex lattice.

Keywords     Nb superconductor, interaction of vortices with dislocations, cryo-Lorentz electron microscope, vortex pinning, Abrikosov lattice

Received      2 April 1998, accepted 30 July 1998


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