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Electron Microscopy Study on Magnetic Flux Lines in Superconductors: Memorial to Akira Tonomura

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3 Author(s)
Harada, K. ; Hitachi Central Res. Lab., Hatoyama, Japan ; Osakabe, N. ; Ono, Y.A.

Using electron holography and coherent beam Lorentz microscopy, Akira Tonomura investigated the physics of magnetic flux lines, or vortices, in metal and high-temperature superconductors for more than 20 years. The methodology he developed for doing this made use of coherent electron waves from cold-emission (field-emission) sources and their quantum-mechanical phase shifts. Using 300-kV and 1-MV electron microscopes, Tonomura and his team clarified the dynamic behavior of magnetic flux lines in Pb and Nb superconductors and in high-temperature YBa2Cu3O7-δ and Bi2Sr2CaCu2O8 + δ superconductors. This memorial paper reviews the static and dynamic flux-line behaviors in superconductors as revealed by their results.

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Applied Superconductivity, IEEE Transactions on  (Volume:23 ,  Issue: 1 )