ARPES on Na₀.₆CoO₂: Fermi surface, extended flat dispersion, and unusual band splitting
Yang, H. -B. · Wang, S. -C. · Sekharan, A. K. P. · Matsui, H. · Souma, S. · Sato, T. · Takahashi, T. · Takeuchi, T. · Campuzano, J. C. · Jin, R. · Sales, B. C. · Mandrus, D. · Wang, Z. · Ding, H.
Original · EN
The electronic structure of single crystals Na₀.₆CoO₂, which are closely related to the superconducting Na₀.₃CoO₂.yH₂O (Tc 5K), is studied by angle-resolved photoelectron spectroscopy. While the measured Fermi surface is found to be consistent with the prediction of a local density band theory, the energy dispersion is highly renormalized, with an anisotropy along the two principle axes (Γ-K, Γ-M). Our ARPES result also indicates that an extended flat band is formed slightly above EF along Γ-K. In addition, an unusual band splitting is observed in the vicinity of the Fermi surface along the Γ-M direction, which differs from the predicted bilayer splitting.
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