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.

4+ pages, 5 Figs

References in corpus (8)

• Fermi surface and quasiparticle dynamics of Na(x)CoO2 {x=0.7} investigated by Angle-Resolved Photoemission Spectroscopy
• Fermi surface evolution and Luttinger theorem in Na${}_x$CoO${}_2$: a systematic photoemission study
• Ferromagnetic fluctuation and possible triplet superconductivity in Na_xCoO_2*yH_2O: Fluctuation-exchange study of multi-orbital Hubbard model
• Electron correlation and Fermi surface topology of Na${}_x$CoO${}_2$
• Low-lying quasiparticle states and hidden collective charge instabilities in parent cobaltate superconductors (NaxCoO2)
• The Fermi surface of Na${}_x$CoO${}_2$
• Destruction of the small Fermi surfaces in Na${}_x$CoO${}_2$ by Na disorder
• Shubnikov de Haas effect in the metallic state of Na${}_{0.3}$CoO${}_2$

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• Local moment, itinerancy and deviation from Fermi liquid behavior in Na${}_x$CoO${}_2$ for $0.71\le x\le 0.84$
• The low-energy ARPES and heat capacity of Na${}_{0.3}$CoO${}_2$: A DMFT study
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• Coulomb correlations do not fill the e'_g hole pockets in Na_{0.3}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
• The electronic structure of the Na${}_x$CoO${}_2$ surface
• Spin fluctuations, magnetic long-range order and Fermi surface gapping in NaxCoO2
• The origin of a${}_{1g}$ and e${}_g$' orderings in Na${}_x$CoO${}_2$
• 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