Observation of structures of chain vortices inside anisotropic high-T-c superconductors
10 June 2002
In order to elucidate the formation mechanism of unconventional arrangements of vortices in high-T-c 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 YBaCu3 O-7,O-8 . Vortex lines in the chain-lattice state in Bi2Sr 2CaCu2O (8+delta) , on the other hand, are all perpendicular to the layer plane, and therefore only vortices lined up along Josephson vortices form chains.