Abstract
The effect of oxygen depletion on YBCO film is investigated via penetration depth measurements. The T-dependence is measured in high precision for each oxygen concentration. λ( T/ T c )/ λ(0) vs. T/ T c for our films is almost identical for different oxygen content. For a fully oxygenated film, it agrees extremely well with the crystal data for T > 25K. 1/λ 2(0) which is proportional to superfluid density is reduced by factor 10 as T c is reduced to 48K. T c vs. 1/ λ 2(0) in our result basically reproduces μSR result on bulk by Uemura et al. except the approximately 25% smaller value in 1/λ 2(0) of film, which can be interpreted as impurity effect in a d-wave superconductor.
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