Electron-phonon interaction dressed by electronic correlations near charge ordering as the origin for superconductivity in cobaltates

Details Electron-phonon interaction dressed by electronic correlations near charge ordering as the origin for superconductivity in cobaltates Electron-phonon interaction dressed by electronic correlations near charge ordering as the origin for superconductivity in cobaltates

2006-08-18

arxiv.org/abs/cond-mat/0608428v1

Physics

Condensed Matter

Strongly Correlated Electrons

21 pages, 6 figures

Scientific paper

10.1088/0953-8984/18/50/002

We consider possible routes to superconductivity in hydrated cobaltates Na_xCoO_2.yH_2O on the basis of the t-J-V model plus phonons on the triangular lattice. We studied the stability conditions for the homogeneous Fermi liquid (HFL) phase against different broken symmetry phases. Besides the sqrt(3)xsqrt(3)-CDW phase, triggered by the nearest-neighbour Coulomb interaction V, we have found that the HFL is unstable, at very low doping, against a bond-ordered phase due to J. We also discuss the occurrence of phase separation at low doping and V. The interplay between the electron-phonon interaction and correlations near the sqrt(3)xsqrt(3)-CDW leads to superconductivity in the unconventional next-nearest neighbour f-wave (NNN-f) channel with a dome shape for Tc around x ~ 0.35, and with values of a few Kelvin as seen in experiments. Near the bond-ordered phase at low doping we found tendencies to superconductivity with d-wave symmetry for finite J and x<0.15. Contact with experiments is given along the paper.

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