Profile structure of magnetic flux lines in type-II superconductor from a rectangular electron hologram.
Profile magnetic configuration of a quantized flux line and flux-line lattice penetrating a type-II superconductor thin foil, niobium, was observed by electron holography and Lorentz microscopy using a 300 kV field-emission electron microscope. Each single flux line was distributed periodically as lattice structure in the mixed state just below its critical temperature of 8.5 K, while at low temperature of 5 K the flux lines were weakly bound as bundles. In order to observe the flux-line distribution over a wide area, discrete Fourier transform reconstruction in the holography was extended for a rectangular area without loss of information and data precision.
Harada
Ken
K
Advanced Research Laboratory, Hitachi Ltd, Hatoyama, Saitama 350-0395, Japan. harada@harl.hitachi.co.jp
Beleggia
Marco
M
Endo
Junji
J
Kasai
Hiroto
H
Togawa
Yoshihiko
Y
Matsuda
Tsuyoshi
T
Tonomura
Akira
A