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

P. Lemmens, V. Gnezdilov, N. N. Kovaleva +8

We report on a Raman scattering study on the superconducting cobaltite $N{a}_{x}Co{O}_2\cdot y{H}_{2}O$ as function of Na content and hydration (x$\approx$1/3, 3/4 and y$\approx$0, 2/3, 4/3)…