Observation of structures of chain vortices inside anisotropic high- Tc superconductors.
In order to elucidate the formation mechanism of unconventional arrangements of vortices in high- Tc superconducting thin films at an inclined magnetic field to the layer plane, we investigated the structures of vortex lines inside the films by Lorentz microscopy using our 1-MV field-emission electron microscope. Our observation results concluded that vortex lines are tilted to form linear chains in YBaCu3O(7,8). Vortex lines in the chain-lattice state in Bi2Sr2CaCu2O(8+delta), on the other hand, are all perpendicular to the layer plane, and therefore only vortices lined up along Josephson vortices form chains.
Tonomura
A
A
Advanced Research Laboratory, Hitachi, Ltd., Hatoyama, Saitama 350-0395, Japan. tonomura@harl.hitachi.co.jp
Kasai
H
H
Kamimura
O
O
Matsuda
T
T
Harada
K
K
Yoshida
T
T
Akashi
T
T
Shimoyama
J
J
Kishio
K
K
Hanaguri
T
T
Kitazawa
K
K
Masui
T
T
Tajima
S
S
Koshizuka
N
N
Gammel
P L
PL
Bishop
D
D
Sasase
M
M
Okayasu
S
S