Effect of Na content and hydration on the excitation spectrum of the cobaltite Na_xCoO_2 yH_2O

Details Effect of Na content and hydration on the excitation spectrum of the cobaltite Na_xCoO_2 yH_2O Effect of Na content and hydration on the excitation spectrum of the cobaltite Na_xCoO_2 yH_2O

2003-09-08

arxiv.org/abs/cond-mat/0309186v1

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 4 figures, for further information see http://www.peter-lemmens.de

Scientific paper

10.1088/0953-8984/16/11/041

We report on a Raman scattering study on the superconducting cobaltite $Na_xCoO_2\cdot yH_2O$ as function of Na content and hydration (x$\approx$1/3, 3/4 and y$\approx$0, 2/3, 4/3). The observed phonon scattering and scattering continua are analyzed in terms of lattice strain due to the structural misfit and disorder. Hydration, due to the intercalation of one or two $H_2O$ layers, releases a part of this strain. Our Raman data suggest a connection between disorder on the partly occupied Na sites, the split off of the $a_{1g}$ level from the other $t_{2g}$ states of $Co^{4+}$ and superconductivity.

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