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Based on experimental 59Co-NMR data in the temperature range between 0.1 and300 K, we address the problem of the character of the Co 3d-electron basedmagnetism in Na0.7CoO2. Temperature dependent 59Co-NMR spectra reveal differentCo environments below 300 K and their differentiation increases with decreasingtemperature. We show that the 23Na- and 59Co-NMR data may consistently beinterpreted by assuming that below room temperature the Co 3d-electrons areitinerant. Their magnetic interaction appears to favor an antiferromagneticcoupling, and we identify a substantial orbital contribution corb to thed-electron susceptibility. At low temperatures corb seems to acquire sometemperature dependence, suggesting an increasing influence of spin-orbitcoupling. The temperature dependence of the spin-lattice relaxation rateT1-1(T) confirms significant variations in the dynamics of this electronicsubsystem between 200 and 300K, as previously suggested. Below 200 K, Na0.7CoO2may be viewed as a weak antiferromagnet with TN below 1 K but this scenariostill leaves a number of open questions.Comment: 8.7 pages, 6 Figures, submitted to Phys. Rev.

physical review. b, condensed matter and materials physics

Localized versus itinerant magnetic moments in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Na</mml:mi><mml:mn>0.7</mml:mn></mml:msub><mml:mi mathvariant="normal">Co</mml:mi><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>

Localized versus itinerant magnetic moments inNa0.7CoO2