Emergent charge ordering in near half doped Na$_{0.46}$CoO$_{2}$

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dc.creatorArgyriou, D. N.
dc.creatorProkhnenko, O.
dc.creatorKiefer, K.
dc.creatorMilne, C. J.
dc.date2007-09-07
dc.date.accessioned2026-07-07T09:44:23Z
dc.date.available2026-07-07T09:44:23Z
dc.descriptionWe have utilized neutron powder diffraction to probe the crystal structure of layered Na$_{x}$CoO$_{2}$ near the half doping composition of $x=$0.46 over the temperature range of 2 to 600K. Our measurements show evidence of a dynamic transition in the motion of Na-ions at 300K which coincides with the onset of a near zero thermal expansion in the in-plane lattice constants. The effect of the Na-ordering on the CoO$_{2}$ layer is reflected in the octahedral distortion of the two crystallographically inequivalent Co-sites and is evident even at high temperatures. We find evidence of a weak charge separation into stripes of Co$^{+3.5+ε}$ and Co$^{+3.5-ε}$, $ε\sim0.06e$ below \Tco=150K. We argue that changes in the Na(1)-O bond lengths observed at the magnetic transition at \tm=88K reflect changes in the electronic state of the CoO$_{2}$ layer
dc.description7 pages, 6 figures, in press Phys. Rev. B
dc.identifierhttps://arxiv.org/abs/0709.1038
dc.identifierhttp://arxiv.org/abs/0709.1038
dc.identifierPhys. Rev. B 76, 134506 (2007)
dc.identifierdoi:10.1103/PhysRevB.76.134506
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/162856
dc.subjectStrongly Correlated Electrons
dc.subjectSuperconductivity
dc.titleEmergent charge ordering in near half doped Na$_{0.46}$CoO$_{2}$
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