Abstract
Measurements are reported of the low-frequency absorptivity of Bi2Sr2CaCu2O8+delta crystals at 16 K from under to overdoping (oxygen content). At optimal doping the magnitude of the absorptivity is 0.4% between 0.6 and 7 THz and the conductivity is dominated by peaks at zero frequency and 30 THz separated by a deep minimum. The minimum is not evident in the under and overdoped samples. The ...
Abstract
Measurements are reported of the low-frequency absorptivity of Bi2Sr2CaCu2O8+delta crystals at 16 K from under to overdoping (oxygen content). At optimal doping the magnitude of the absorptivity is 0.4% between 0.6 and 7 THz and the conductivity is dominated by peaks at zero frequency and 30 THz separated by a deep minimum. The minimum is not evident in the under and overdoped samples. The increased absorptivity when doped away from optimal indicates that the spectral distribution of quasiparticles is dopant dependent due to changes in the elastic and inelastic scattering contributions.
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