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dc.contributor.author | Alloul H. | |
dc.contributor.author | Mukhamedshin I. | |
dc.contributor.author | Blanchard N. | |
dc.contributor.author | Collin G. | |
dc.date.accessioned | 2018-09-17T21:30:47Z | |
dc.date.available | 2018-09-17T21:30:47Z | |
dc.date.issued | 2005 | |
dc.identifier.issn | 1155-4339 | |
dc.identifier.uri | https://dspace.kpfu.ru/xmlui/handle/net/135087 | |
dc.description.abstract | Oriented powder samples of NaxCoO2, with quasi single phase composition have been synthesized and studied by x rays, SQUID magnetometry, 23Na and 59Co NMR. We evidence that the dry and superconducting (SC) samples with x ≈ 0.35 differ from those with 0.50 ≤ x < 1 inasmuch as the Co sites display an uniform charge state in the former while they differentiate markedly in the latter. For 0.50 ≤ x < 1, the local Co charge and magnetic properties appear correlated with definite orderings of the Na+ ions. For x ≃ 0.70 we could distinguish non magnetic Co3+ sites with no spin susceptibility from more magnetic Co sites, among which Co4+ sites can be excluded. These sites form a single strongly correlated electronic band which exhibits a quasi localized T dependent magnetism which might only become Fermi liquid like below 2K. This contrasts with the Pauli like magnetism found for x ≈ 0.35 in the dry and SC compounds. Those display quasi identical metallic states, with a weak spin susceptibility which only contributes to a small shift of the 59Co NMR. Its variation below Tc reveals a strong suppression of the spin susceptibility, compatible with singlet superconducting pairing. © EDP Sciences. | |
dc.relation.ispartofseries | Journal De Physique. IV : JP | |
dc.title | Superconductivity, charge order and anomalous magnetism in sodium cobaltates | |
dc.type | Conference Paper | |
dc.relation.ispartofseries-volume | 131 | |
dc.collection | Публикации сотрудников КФУ | |
dc.relation.startpage | 27 | |
dc.source.id | SCOPUS11554339-2005-131-SID33645090450 |