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

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

2007-05-04

arxiv.org/abs/0705.0529v2

Phys. Rev. B 76, 180402(R) (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

revtex4 file, 5 pages, 3 figures, published version

Scientific paper

10.1103/PhysRevB.76.180402

We 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 $xx_c$, 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, $\mu$SR, and NMR experiments on the evolution of the magnetic properties in the sodium rich phases.

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