Inhaltszusammenfassung

YBa2Cu3O7 films deposited on Al2O3 by laser ablation show c-axis oriented growth and critical temperatures Tc as high as 90 K. However the critical current density Jc is comparatively low. An improvement was achieved by using a ZrO2 intermediate layer which acts as a diffusion barrier. Bilayer YBa2Cu3O7/ZrO2 films prepared in-situ by laser ablation from a multi-target system under various conditions and with several buffer layer thicknesses exhibited Jc-values up to 5·105 A/cm2 at 77 K. The s...YBa2Cu3O7 films deposited on Al2O3 by laser ablation show c-axis oriented growth and critical temperatures Tc as high as 90 K. However the critical current density Jc is comparatively low. An improvement was achieved by using a ZrO2 intermediate layer which acts as a diffusion barrier. Bilayer YBa2Cu3O7/ZrO2 films prepared in-situ by laser ablation from a multi-target system under various conditions and with several buffer layer thicknesses exhibited Jc-values up to 5·105 A/cm2 at 77 K. The structure and the surfaces of the films were characterised by x-ray diffraction and scanning electron microscopy, respectively. The critical current density was measured as function of temperature, external magnetic field B, and relative orientation between B and the film surfaces. » weiterlesen» einklappen

Autoren

Klassifikation

DFG Fachgebiet:
Physik der kondensierten Materie

DDC Sachgruppe:
Physik