Dynamics of local magnetic flux vortexes in superconductors

The dynamics of local magnetic flux vortexes in high-temperature semiconduc tors is studied with a mechanical method. Physical conditions in a gradient magnetic field are analyzed. Obtained results are treated within a model o f free and pinned vortexes. The magnitudes of elastic modula, pinning stren gth, dissipated energy, viscous friction of the vortexes, and pinning poten tial were calculated. The method allows the determination of local, rather than integrated, superconductor characteristics. This makes it possible to map pinning centers over the crystal structure. (C) 2000 MAIK "Nauka/Interp eriodica".