Microwave measurements of overdoped Y0.9Ca0.1Ba2Cu3O7-δ thin films

E. Farber*, G. Deutscher

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


In the present report we show, for the first time, that a complex order parameter is not just a surface effect, but a bulk: property in overdoped Y0.9Ca0.1Ba2Cu3O7- δ thin films. The penetration depth change versus temperature is very well fitted to a complex order parameter of the form Δdx2 - y2 + iδdxy, where Δ = 14.5 me V and δ = 2meV. This result contrasts our previous results for optimally doped YBCO thin films where a power law for the penetration depth versus temperature was reported, corresponding to a dx2-y2 - wave order parameter. The penetration depth behavior is accompanied by a rapid reduction of the scattering rate at low temperatures, in contrast with a flattening of this quantity for the optimally doped YBCO films.

Original languageEnglish
Pages (from-to)563-567
Number of pages5
JournalJournal of Low Temperature Physics
Issue number3-4
StatePublished - May 2003


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