Na atomic order, Co charge disproportionation and magnetism in Na$_{x}$CoO$_{2}$ for large Na contents

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dc.creatorAlloul, H.
dc.creatorMukhamedshin, I. R.
dc.creatorCollin, G.
dc.creatorBlanchard, N.
dc.date2008-03-10
dc.date.accessioned2026-07-07T09:26:06Z
dc.date.available2026-07-07T09:26:06Z
dc.descriptionWe have synthesized and characterized four different stable phases of Na ordered Na$_{x}$CoO$_{2}$, for $0.65<x<0.8$. Above 100 K they display similar Curie-Weiss susceptibilities as well as ferromagnetic $q=0$ spin fluctuations in the CoO$_{2}$ planes revealed by $^{23}$Na NMR data. In all phases from $^{59}$Co NMR data we display evidences that the Co disproportionate already above 300 K into non magnetic Co$^{3+}$ and magnetic $\approx $Co$^{3.5+}$ sites on which holes delocalize. This allows us to understand that metallic magnetism is favored for these large Na contents. Below 100 K the phases differentiate, and a magnetic order sets in only for $x\gtrsim 0.75$ at $T_{N}=$22 K. We suggest that the charge order also governs the low $T$ energy scales and transverse couplings.
dc.identifierhttps://arxiv.org/abs/0803.1493
dc.identifierhttp://arxiv.org/abs/0803.1493
dc.identifierEurophysics Letters v.82 p.17002 (2008)
dc.identifierdoi:10.1209/0295-5075/82/17002
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/156636
dc.subjectStrongly Correlated Electrons
dc.subjectSuperconductivity
dc.titleNa atomic order, Co charge disproportionation and magnetism in Na$_{x}$CoO$_{2}$ for large Na contents
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