Inhaltszusammenfassung

We report the preparation of Bi2Sr2CaCu2Oy-thin films with inductively measured Tc-values of up to 92 K by dc-sputtering from a single stoichiometric target in pure oxygen atmosphere. The excellent structural properties of these films are revealed by X-ray diffraction in Bragg-Brentano-geometry, ?-Scans and RBS. In detail we present measurements of the resistive transitions in magnetic fields up to 10 T, the depinning-line and the field-dependence of the activation energy. Measurements of the...We report the preparation of Bi2Sr2CaCu2Oy-thin films with inductively measured Tc-values of up to 92 K by dc-sputtering from a single stoichiometric target in pure oxygen atmosphere. The excellent structural properties of these films are revealed by X-ray diffraction in Bragg-Brentano-geometry, ?-Scans and RBS. In detail we present measurements of the resistive transitions in magnetic fields up to 10 T, the depinning-line and the field-dependence of the activation energy. Measurements of the critical current density (jc(70 K)=106 A/cm2) exhibit a comparatively slow decline of jc with increasing magnetic field. The angular dependences of jc and of the magnetoresistance in external fields confirm the two dimensional behavior of the 2212-compound, in the latter case even up to 4 K above Tc. Furthermore we found a clear correlation between the critical temperature of the films and their carrier density and mobility. » weiterlesen» einklappen

Autoren

Klassifikation

DFG Fachgebiet:
Physik der kondensierten Materie

DDC Sachgruppe:
Physik