Cooperative effect of phonons and electronic correlations for superconductivity in cobaltates
Abstract
We propose that unconventional superconductivity in hydrated sodium cobaltate NaxCoO2 results from an interplay of electronic correlations and electron-phonon interactions. On the basis of the t-V model plus phonons we found evidences for a) unconventional superconductivity, b) realistic values of Tc and c) the dome shape existing near x 0.35. This picture is obtained for V close to the critical Coulomb repulsion Vc which separates the uniform Fermi liquid from 3 × 3 CDW ordered phase.
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