Oxygen diffusion in epitaxial Bi 2 Sr 2 CaCu 2 O 8+δ thin films

Superconducting Bi 2 Sr 2 CaCu 2 O 8+δ thin films (T c ≃85K) were prepared on off-c-axis (001) SrTiO 3 substrates by pulsed laser deposition. High quality oriented film growth with a c-axis inclined with respect to the surface normal by a tilt angle α is found up to α ≃ 15° from SEM, XRD and resistivity measurements. Isothermal oxygen diffusion is monitored by in-situ electrical resistance measurements at temperatures ranging from 200°C...400°C. From the temporal evolution of the resistance the “in-plane” diffusion constant D ab is determined.