Robust finite gap in overdoped Y0.9Ca0.1Ba 2Cu3O7-δ thin films

E. Farber, G. Deutscher, B. Gorshunov, M. Dressel

Research output: Contribution to journalArticlepeer-review


A flattening of the penetration depth variation, Δλ(T), was observed in overdoped Y0.9Ca0.1Ba2Cu 3O7-δ thin films at low temperature. That observation was measured also in imperfect thin films, which contain a large density of a-axis grains. Lack of a model combining a crossover from a finite gap into a dx2-y2-wave within the unitary limit for the imperfect films, we have fitted our data using the BCS model. That best fit yields a finite gap of 1.7 meV, which is comparable with the idxy component obtained for films without a-axis grain where a complex order parameter was used. That flattening is accompanied by a steeper reduction of the quasi-particles scattering rate below 15 K for both quality thin films.

Original languageEnglish
Pages (from-to)428-430
Number of pages3
JournalJournal of Physics and Chemistry of Solids
Issue number1-3
StatePublished - Jan 2006


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