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We have measured the penetration depth of overdoped Y0.9Ca0.1Ba2Cu3O7-delta(Ca-YBCO) thin films using two different methods. The change of the penetrationdepth as a function of temperature has been measured using the parallel plateresonator (PPR), while its absolute value was obtained from a quasi-opticaltransmission measurements. Both sets of measurements are compatible with anorder parameter of the form: Delta*dx2-y2+i*delta*dxy, with Delta=14.5 +- 1.5meV and delta=1.8 meV, indicating a finite gap at low temperature. Below 15 Kthe drop of the scattering rate of uncondensed carriers becomes steeper incontrast to a flattening observed for optimally doped YBCO films. This decreasesupports our results on the penetration depth temperature dependence. Thefindings are in agreement with tunneling measurements on similar Ca-YBCO thinfilms.Comment: 11 pages, 4 figure

europhysics letters

Evidence for a bulk complex order parameter in Y 0.9 Ca 0.1 Ba 2 Cu 3 O 7 −δ thin films