Itinerant and localized magnetism on the triangular lattice: sodium rich phases of Na$_x$CoO$_2$

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dc.creatorGao, Meng
dc.creatorZhou, Sen
dc.creatorWang, Ziqiang
dc.date2007-05-04
dc.date2007-11-13
dc.date.accessioned2026-07-07T08:42:09Z
dc.date.available2026-07-07T08:42:09Z
dc.descriptionWe study the interplay between correlation, itinerant ferromagnetism and local moment formation on the electron doped triangular lattice of sodium cobaltates Na$_x$CoO$_2$. We find that strong correlation renormalizes the Stoner criterion and stabilizes the paramagnetic state for $x<x_c\simeq0.67$. For $x>x_c$, ferromagnetic (FM) order emerges. The enhanced Na dopant potential fluctuations play a crucial role in the sodium rich phases and lead to an inhomogeneous FM state, exhibiting nonmagnetic Co$^{3+}$ patches, antiferromagnetic (AF) correlated regions, and FM clusters with AF domains. Hole doping the band insulator at x=1 leads to the formation of local moments near the Na vacancies and AF correlated magnetic clusters. We explain recent observations by neutron, $μ$SR, and NMR experiments on the evolution of the magnetic properties in the sodium rich phases.
dc.descriptionrevtex4 file, 5 pages, 3 figures, published version
dc.identifierhttps://arxiv.org/abs/0705.0529
dc.identifierhttp://arxiv.org/abs/0705.0529
dc.identifierPhys. Rev. B 76, 180402(R) (2007)
dc.identifierdoi:10.1103/PhysRevB.76.180402
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/141865
dc.subjectStrongly Correlated Electrons
dc.titleItinerant and localized magnetism on the triangular lattice: sodium rich phases of Na$_x$CoO$_2$
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