Theory of carrier concentration-dependent electronic behavior in layered cobaltates

Abstract

A natural explanation for the carrier concentration-dependent electronic behavior in the layered cobaltates emerges within correlated-electron Hamiltonians with finite on-site and significant nearest neighbor hole-hole Coulomb repulsions. The nearest neighbor repulsion decreases hole double-occupancy below hole density 1/3, but increases the same at higher hole densities. Our conclusion is valid for both single-band and three-band extended Hubbard Hamiltonians, and sheds light on concentration-dependent $e_g^{\prime }$ hole occupancy within the latter.

4 pages, 4 figures

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Cited by in corpus (8)

• The Paired Electron Crystal: order from frustration in the quarter-filled band
• From charge- and spin-ordering to superconductivity in the organic charge-transfer solids
• The Valence Transition Model of Pseudogap, Charge-Order and Superconductivity in Electron- and Hole-Doped Copper Oxides
• Strong correlations enhanced by charge-ordering in highly doped cobaltates
• The chemical physics of unconventional superconductivity
• Is there a common theme behind the correlated-electron superconductivity in organic charge-transfer solids, cobaltates, spinels and fullerides?
• Enhanced low energy fluctuations and increasing out-of-plane coherence in vacancy ordered NaxCoO2
• Similarities in electronic properties of organic charge-transfer solids and layered cobaltates