Abstract
The optical conductivity of the CuO double chains of PrBa 2Cu 4O 8 is calculated by the mean-field approximation for the coupled two-chain Hubbard model around quarter filling. We show that the ∼40 meV peak structure, spectral shape, and small Drude weight observed in experiment are reproduced well when the stripe-type charge ordering is present. We thereby argue that the observed anomalous optical response may be due to the presence of stripe-type fluctuations of charge carriers in the CuO double chains.
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