Cooperative effect of phonons and electronic correlations for superconductivity in cobaltates
A. Foussats, A. Greco, M. Bejas, A. Muramatsu
DOI 10.1103/PhysRevB.72.020504 · Physical Review B
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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 evidence 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 charge-density-wave-ordered phase.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NaxCoO2.yH2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5 | Pressure not reported | unknown |
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