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Raman spectroscopy measurements have been performed on alpha-, beta-,gamma-NaxCoO2 phases differing in their stacking of CoO6 octahedra along thec-axis direction. The results demonstrate that, in general, there are fiveactive phonons for gamma-Na0.75CoO2, two Raman active phonons for alpha-NaCoO2,and four Raman active phonons for beta-NaCoO2. We have also performed Ramanscattering measurements on several gamma-(Ca,Sr)xCoO2 (0.15 <= x <= 0.35)samples which show well-defined intercalated Ca/Sr-ordering. The experimentaldata show that the intercalated cation ordering could result in visiblealterations on Raman spectral structures. The observations of the spectralchanges along with the variation of the CoO6 stacking, as well as theintercalated Sr/Ca ordering suggest that the interlayer interaction plays animportant role for understanding the lattice dynamics in this layered system.Comment: 23 pages, 5 figures, Physical Review B, in pres

physical review. b, condensed matter and materials physics

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Raman spectroscopy study ofα-,β-,γ−NaxCo