Evidence for non-conventional pairing in Na$\_x$CoO$\_2$$\cdot$yH$\_2$O

Details Evidence for non-conventional pairing in Na$\_x$CoO$\_2$$\cdot$yH$\_2$O Evidence for non-conventional pairing in Na$\_x$CoO$\_2$$\cdot$yH$\_2$O

2006-01-13

arxiv.org/abs/cond-mat/0601288v1

Physics

Condensed Matter

Strongly Correlated Electrons

submitted to PRL

Scientific paper

We report on first investigation of the lattice dynamics in the novel superconducting material Na$\_{0.35}$CoO$\_2$$\cdot$1.3H$\_2$O and the non-hydrated parent compound Na$\_{0.7}$CoO$\_2$ by inelastic x-ray scattering. The measured phonon dispersion along the $\Gamma-M$ direction show a marked softening with hole doping of two optical phonon branches close to the Brillouin zone boundary. The phonon spectra, dispersion, and softening are well reproduced by first-principle calculations. The calculations indicates that the soft branches are mainly composed of Co-vibration modes. The estimation of the critical temperature based on electron-phonon coupling mechanism undisputedly points to a non-conventional superconducting state in this material.

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