Abstract
The c-axis optical conductivity spectra were investigated for YBa 2Cu 3O y with y<6.9. By subtracting phonon contributions, it was found that the far-infrared conductivity for the high temperature “metallic” regime of ϱ c increases with reducing temperature over a wide frequency range, while, in the low temperature region with “semiconducting” ϱ c, the conductivity is suppressed below a characteristic frequency which seems to decrease from 700cm −1 to 500cm −1 with doping, although an anomalous spectral growth around 400cm −1 misleads a critical frequency of the suppression for highly reduced crystals.
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