Journal
PHYSICAL REVIEW LETTERS
Volume 85, Issue 5, Pages 1116-1119Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.85.1116
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We report on a study on the effect of Nd/Ba disorder on the ab-plane penetration depth of epitaxial Nd1+xBa2-xCu3O7-delta thin films. While in stoichiometric samples lambda(T) at low temperature is linear, Nd-rich films exhibit a quadratic law. For low Nd excess (x < 0.04), a satisfying fit is obtained using the dirty d-wave model assuming that Nd ions at Ba sites act as strong scattering centers. At high x (x > 0.15) the data are explained if Nd/Ba disorder becomes less effective as a source of scattering. The effect of localization has been discussed to account for the experimental results.
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