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

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

2006-11-24

arxiv.org/abs/cond-mat/0611621v1

Phys. Rev. Lett. 97, 186405 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

4+ pages, 5 Figs

Scientific paper

10.1103/PhysRevLett.97.186405

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.

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