Evidence for non-conventional pairing in Na$_x$CoO$_2$$\cdot$yH$_2$O - Laboratoire de Chimie Physique-Matière et Rayonnement Accéder directement au contenu
Pré-Publication, Document De Travail Année : 2006

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

Résumé

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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Dates et versions

hal-00016869 , version 1 (13-01-2006)

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Jean-Pascal Rueff, M. Calandra, M. d'Astuto, Ph. Leininger, A. Shukla, et al.. Evidence for non-conventional pairing in Na$_x$CoO$_2$$\cdot$yH$_2$O. 2006. ⟨hal-00016869⟩
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