Disproportionation and Critical Interaction Strength in Na$_x$CoO$_2$: Concentration Dependence

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dc.creatorLee, K. -W.
dc.creatorPickett, W. E.
dc.date2005-08-26
dc.date.accessioned2026-07-07T06:28:03Z
dc.date.available2026-07-07T06:28:03Z
dc.descriptionWe present results of studies of charge disproportionation (CD) and spin differentiation in Na$_x$CoO$_2$ using the correlated band theory approach (local-density approximation+Hubbard U:LDA+U). The simultaneous CD and gap opening can be followed through a first order charge disproportionation transition. By comparison with experiments, we propose a value of the Coulomb repulsion strength U($x$) that has significant dependence on the carrier concentration $x$, for which we obtain a phase diagram. The connection between the oxygen height and effects of on-site correlation is also reported.
dc.description3 pages with 4 embedded figures. submitted to proceedings in 2005 50th MMM conference
dc.identifierhttps://arxiv.org/abs/cond-mat/0508649
dc.identifierhttp://arxiv.org/abs/cond-mat/0508649
dc.identifierJ. Appl. Phys. 99, 08P702 (2006)
dc.identifierdoi:10.1063/1.2173220
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/97597
dc.subjectStrongly Correlated Electrons
dc.subjectSuperconductivity
dc.titleDisproportionation and Critical Interaction Strength in Na$_x$CoO$_2$: Concentration Dependence
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