Cooperative effect of phonons and electronic correlations for superconductivity in cobaltates

Details Cooperative effect of phonons and electronic correlations for superconductivity in cobaltates Cooperative effect of phonons and electronic correlations for superconductivity in cobaltates

2004-10-12

arxiv.org/abs/cond-mat/0410290v2

Phys.Rev.B72,020504(R)(2005)

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures

Scientific paper

10.1103/PhysRevB.72.020504

We propose that unconventional superconductivity in hydrated sodium cobaltate $Na_xCoO_2$ 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.

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