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| HAL : hal-00269073, version 1 |
| arXiv : cond-mat/0701595 |
| DOI : 10.1103/PhysRevLett.98.246402 |
| Fiche détaillée |  Récupérer au format |
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| Physical Review Letters 98, 24 (2007) 246402 |
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| Electronic Correlations in CoO2, the Parent Compound of Triangular Cobaltates |
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| C. De Vaulx 1M. -H. Julien 1 |
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| (15/06/2007) |
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| 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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| 1 : | Laboratoire de Spectrométrie Physique (LSP) |
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CNRS : UMR5588 – Université Joseph Fourier - Grenoble I |
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| 2 : | Laboratoire des champs magnétiques intenses (LCMI-GHMFL) |
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CNRS : UPR5021 |
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| 3 : | Laboratoire de cristallographie et sciences des matériaux (CRISMAT) |
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CNRS : UMR6508 – Université de Caen Basse-Normandie – Ecole Nationale Supérieure d'Ingénieurs de Caen |
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| Domaine | : | Physique/Matière Condensée/Autre |
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| Lien vers le texte intégral : |
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| http://fr.arXiv.org/abs/cond-mat/0701595 |
| hal-00269073, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00269073 | |
| oai:hal.archives-ouvertes.fr:hal-00269073 | |
| Contributeur : Claude Berthier | |
| Soumis le : Mercredi 2 Avril 2008, 10:20:37 | |
| Dernière modification le : Mercredi 2 Avril 2008, 10:20:37 | |
