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Neutron inelastic scattering studies on aligned crystals of NaxCoO2.yD2O havebeen carried out. Significant scattering has been observed for phononsoriginating from the vibrations of the short-range ordered D2O molecules. Nofirm evidence for the magnetic fluctuations has been found for theNaxCoO2.yD2O, while the very weak intensity modulation observed in the j scansalong (1/2, 1/2, j) suggests the existence of the antiferromagneticfluctuations in the non-deuterated parts of the sample, the volume fraction ofwhich is estimated to be about 26 %. The present results indicate that magneticfluctuations, especially ferromagnetic ones are rather weak, in the deuteratedsystem, which is consistent with the results of the NMR Knight shift reportedby the present authors' group. We discuss the short-range ordered state of D2O,too by analyzing the observed diffuse scattering.Comment: 6 pages, 8 figure

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