<sup>17</sup>O NMR Measurements on Superconducting Na<sub>0.35</sub>CoO<sub>2</sub>·<i>y</i>H<sub>2</sub>O

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  • 17O NMR Measurements on Superconducting Na0.35CoO2 yH2O

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An 17O NMR measurement was performed on nonoriented polycrystalline Na0.35CoO2·yH2O with superconducting (SC) transition temperature Tc=4.6 K. A weak temperature dependence was observed in the Knight shift at the O site (17K). The spin part of 17K (17Kspin) is estimated from the plot of 17K against bulk susceptibility χ. The 17Kspin decreases in the SC state, indicative of the decrease in the in-plane component of the spin susceptibility. The nuclear spin–lattice relaxation rate 1⁄T1 at the O site 17(1⁄T1) shows a good scaling with 1⁄T1 at the Co site 59(1⁄T1). This indicates that the spin fluctuations at the O site originate from the Co spin dynamics. The relationships between 17(1⁄T1T) and 17Kspin and between 17(1⁄T1T) and 59(1⁄T1T) show the development of incommensurate fluctuations at q∼0 other than q=0 below 30 K. A clear indication of ferromagnetic correlations at q=0 was not observed from the present 17O NMR studies.

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