Role of the Interlayer Ionic Vibration in High-Tc Oxide Superconductors

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Abstract
A theoretical model for the newly discovered high-Tc oxide superconductors is proposed. We regard the systems to form the layered structures composed of CuO2-conducting layers sand-wiched by one or two metal-oxide insulating layers for each. Then, by assuming the conduction electrons within a conducting layer to form a two-dimensional tight-binding band, we study the strong coupling between the conduction electrons and the local vibrations of the O-ions in the insulating layers and find that the phonon-mediated electron-electron interaction is strong enough to dominate the on-site repulsion and has finite range, which stabilizes the anisotropic Cooper pairing states. We calculate the superconducting transition temperature Tc using a set of realistic values of the parameters included in the model and find Tc≃26∼80K for the (La1-xAx)2CuO4-systems depending on the average number of the conduction electrons per Cu-ion.

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