Complete d-Band Dispersion and the Mobile Fermion Scale in NaxCoO2

Abstract

We utilize fine-tuned polarization selection coupled with excitation-energy variation of photoelectron signal to image the \textit{complete d}-band dispersion relation in sodium cobaltates. A hybridization gap anticrossing is observed along the Brillouin zone corner and the full quasiparticle band is found to emerge as a many-body entity lacking a pure orbital polarization. At low dopings, the quasiparticle bandwidth (Fermion scale, many-body \textit{E${}_F$} $\sim$ 0.25 eV) is found to be smaller than most known oxide metals. The low-lying density of states is found to be in agreement with bulk-sensitive thermodynamic measurements for nonmagnetic dopings where the 2D Luttinger theorem is also observed to be satisfied.

arXiv comment4+ pages, 5 Figs

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• A precise method for visualizing dispersive features in image plots
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• Emergence of Fermi pockets in an excitonic CDW melted novel superconductor
• Anisotropic chiral d+id superconductivity in NaxCoO2 yH2O
• Can disorder alone destroy the eg' hole pockets of NaxCoO2? A Wannier function based first-principles method for disordered systems
• Anisotropic quasiparticle renormalization in Na0.73CoO2: role of inter-orbital interactions and magnetic correlations
• Phase Diagram of Na${}_x$CoO${}_2$ Studied by Gutzwiller Density Functional Theory
• Competing orders in Na${}_x$CoO${}_2$ from strong correlations on a two-particle level
• Local moment, itinerancy and deviation from Fermi liquid behavior in Na${}_x$CoO${}_2$ for $0.71\le x\le 0.84$
• Mottness on a triangular lattice
• The low-energy ARPES and heat capacity of Na${}_{0.3}$CoO${}_2$: A DMFT study
• Direct observation of strong correlations near the band insulator regime of Bi misfit cobaltates
• The origin of strong correlations and superconductivity in Na${}_x$CoO${}_2$
• Effective Hamiltonian for transition-metal compounds. Application to Na_xCoO_2
• Experimental study of the incoherent spectral weight in the photoemission spectra of the misfit cobaltate [Bi2Ba2O4][CoO2]2
• Coulomb correlations do not fill the e'_g hole pockets in Na_{0.3}CoO_2
• Dynamical mean field theory of an effective three-band model for Na${}_x$CoO${}_2$
• Itinerant and localized magnetism on the triangular lattice: sodium rich phases of Na${}_x$CoO${}_2$
• Spin polaron theory for the photoemission spectra of layered cobaltates
• Getting back to Na_xCoO_2: spectral and thermoelectric properties
• The electronic structure of the Na${}_x$CoO${}_2$ surface
• The origin of a${}_{1g}$ and e${}_g$' orderings in Na${}_x$CoO${}_2$
• Spin fluctuations, magnetic long-range order and Fermi surface gapping in NaxCoO2
• Effect of covalency and interactions on the trigonal splitting in NaxCoO2
• s-wave Superconductivity due to Suhl-Kondo Mechanism in Na${}_x$CoO${}_2\cdot y$H${}_2$O: Effect of Coulomb Interaction and Trigonal Distortion
• Hall effect on the triangular lattice
• Temperature Dependence of Interlayer Magnetoresistance in Anisotropic Layered Metals
• One-particle spectral properties of the t-J-$V$ model on the triangular lattice near charge order
• Evolution of electron Fermi surface with doping in cobaltates
• Statistical fluxes and the Curie-Weiss metal state