College Park, Maryland      June 6 - 10 , 2004

W2-C1 (1:30 PM): Structural and Physical Properties of the NaxCoO2 system (Invited)

Y. S. Lee (Massachusetts Institute of Technology)

Sodium cobalt oxide, NaxCoO2 (with x ~ 0.7), has received considerable attention due to its unusual thermal electric properties. Recent studies have revealed anomalous non-Fermi liquid behavior in transport properties which point to the importance of strong correlations. Interest in this material escalated with the discovery of superconductivity in NaxCoO2 + yH2O when the sodium concentration is reduced to about 0.3 and water is intercalated between the layers. We have developed a novel electrochemical de-intercalation method and have used this to successfully produce single crystal samples of NaxCoO2 with a wide range of compositions (x=0.3 to 0.75). We have performed scattering experiments on both hydrated superconductors and non-hydrated samples. We will discuss our results and how they relate to our measurements of the physical properties in this interesting class of materials.

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