Abstract
When an impurity is placed between chains in quasi-one-dimensional solids, it can cause transfer of electrons between chains through itself. The effects of this impurity induced interchain coupling on polarons are studied by means of the continuum version of the Holstein model. It is found that when the coupling strength exceeds a certain critical value, the polaron wave function extends itself over plural chains surrounding the impurity, rather than being localized on a single chain. Higher conductivity in directions perpendicular to the chains than in the parallel direction observed quite recently in doped halogen-bridged mixed-valence platinum complexes lends support to the above-mentioned picture.
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