Electronic Correlations in CoO2, the Parent Compound of Triangular Cobaltates

Details Electronic Correlations in CoO2, the Parent Compound of Triangular Cobaltates Electronic Correlations in CoO2, the Parent Compound of Triangular Cobaltates

2007-01-24

arxiv.org/abs/cond-mat/0701595v2

Phys. Rev. Lett. 98, 246402 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, submitted

Scientific paper

10.1103/PhysRevLett.98.246402

A 59Co NMR study of CoO2, the x=0 end member of AxCoO2 (A = Na, Li...) cobaltates, reveals a metallic ground state, though with clear signs of strong electron correlations: low-energy spin fluctuations develop at wave vectors q different from 0 and a crossover to a Fermi-liquid regime occurs below a characteristic temperature T*~7 K. Despite some uncertainty over the exact cobalt oxidation state n this material, the results show that electronic correlations are revealed as x is reduced below 0.3. The data are consistent with NaxCoO2 being close to the Mott transition in the x -> 0 limit.

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