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The submillimeter-wave 3 cm{-1} < nu < 35 cm{-1} complex conductivity of thereduced YBa2Cu3O{6+delta} film (Tc=56.5 K) was investigated for temperatures 4K < T < 300 K and compared to the properties of the same film in the optimallydoped state. The frequency dependence of the effective quasiparticle scatteringrate 1/tau*(nu) was extracted from the spectra. 1/tau*(nu) is shown to befrequency independent at low frequencies and high temperatures. A gradualchange to 1/tau*~nu^{1.5} law is observed as temperature decreases. In order toexplain the observed temperature dependence of the low frequency spectralweight above Tc, the quasiparticle effective mass is supposed to be temperaturedependent for T>Tc.Comment: 4 pages, 4 figure

physical review. b, condensed matter

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Frequency-dependent relaxation rate in superconductingYBa2Cu3O