Abstract
We study the metal-insulator transition of BaBi 1- x Pb x O 3 and Ba 1- x K x BiO 3 within a Holstein molecular crystal model. The coherent potential approximation is used to calculate the density of states upon doping in both cases. It is found that in the Pb substituted compound the gap is filled up with impurity states while the pseudo-gap structure survives even in the high doping regime. In the K-doped compound we consider the formation of polaron states in the vicinity of the band edges leading to a rapid decrease of the CDW gap upon doping. The relation to the cuprate superconductors is discussed.
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