Inhaltszusammenfassung

With heavy ion irradiation we create continous amorphous columnar defects in Bi2Sr2CaCu2Os-thin films. With regard to a reliable comparison of Jrradiation effects three of four identical striplines on the same samples were exposed to different irradiation procedures. We performed irradiations as well parallel as under different angles with respect to the film &axis. Beside an enlarged normal state resistivity after irradiation the films suffer a To-reduction proportional to the volume o...With heavy ion irradiation we create continous amorphous columnar defects in Bi2Sr2CaCu2Os-thin films. With regard to a reliable comparison of Jrradiation effects three of four identical striplines on the same samples were exposed to different irradiation procedures. We performed irradiations as well parallel as under different angles with respect to the film &axis. Beside an enlarged normal state resistivity after irradiation the films suffer a To-reduction proportional to the volume of the damaged material. The activation energy ascertained from resistive transitions shows best enhancement .for magnetic field values close to the matching field. Measurements of the transport critical current density, the activation energy and the irreversibility field in different field orientations show no anisotropic flux pinning due to the induced columnar defects. This can be explained by the two dimensional behaviour of the Bi2Sr2 CaCu2 O8-thin films. » weiterlesen» einklappen

Autoren

Klassifikation

DFG Fachgebiet:
Physik der kondensierten Materie

DDC Sachgruppe:
Physik