Electronic Correlations in CoO2, the Parent Compound of Triangular Cobaltates - Archive ouverte HAL
Article Dans Une Revue Physical Review Letters Année : 2007

Electronic Correlations in CoO2, the Parent Compound of Triangular Cobaltates

Résumé

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.

Dates et versions

hal-00269073 , version 1 (02-04-2008)

Identifiants

Citer

C. de Vaulx, M. -H. Julien, C. Berthier, S. Hebert, Valérie Pralong, et al.. Electronic Correlations in CoO2, the Parent Compound of Triangular Cobaltates. Physical Review Letters, 2007, 98 (24), pp.246402. ⟨10.1103/PhysRevLett.98.246402⟩. ⟨hal-00269073⟩

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