Phonon softening in NaxCoO2 · yH2O: Implications for the Fermi surface topology and the superconducting state
Résumé
In this work we investigate the relevance of phonons for the superconductivity in Na0.35CoO2 · 1.3H2O. We measure phonon dispersion in this material as well as in the nonhydrated parent compound Na0.7CoO2 by inelastic x-ray scattering. The measured phonon dispersion along the