Cooperative effect of phonons and electronic correlations for superconductivity in cobaltates

Abstract

We propose that unconventional superconductivity in hydrated sodium cobaltate $N{a}_{x}Co{O}_2$ 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 $T_c$ and c) the dome shape existing near $x\sim 0.35$. This picture is obtained for $V$ close to the critical Coulomb repulsion $V_c$ which separates the uniform Fermi liquid from $\sqrt{3}\times \sqrt{3}$ CDW ordered phase.

arXiv comment4 pages, 3 figures

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• Electron-Phonon mechanism for Superconductivity in Na${}_{0.35}$CoO${}_2$: Valence-Band Suhl-Kondo effect Driven by Shear Phonons
• Crossover between electron-electron and electron-phonon mediated pairing on the Kagome lattice
• Electron-phonon interaction in the lamellar cobaltate Na${}_x$CoO${}_2$
• Electron-phonon interaction dressed by electronic correlations near charge ordering as the origin for superconductivity in cobaltates
• Charge order and phonon renormalizations: Possible implications for cobaltates
• One-particle spectral properties of the t-J-$V$ model on the triangular lattice near charge order