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. 2004 Jun 18;92(24):246403.
doi: 10.1103/PhysRevLett.92.246403. Epub 2004 Jun 18.

ARPES on Na0.6CoO2: Fermi surface and unusual band dispersion

H-B Yang  1 , S-C Wang, A K P Sekharan, H Matsui, S Souma, T Sato, T Takahashi, T Takeuchi, J C Campuzano, R Jin, B C Sales, D Mandrus, Z Wang, H Ding
Affiliations

ARPES on Na0.6CoO2: Fermi surface and unusual band dispersion

H-B Yang et al. Phys Rev Lett. .

Abstract

The electronic structure of single crystals Na0.6CoO2, which are closely related to the superconducting Na0.3CoO2.yH(2)O (T(c) approximately 5 K), is studied by angle-resolved photoelectron spectroscopy. While the measured Fermi surface (FS) is consistent with the large FS enclosing the Gamma point from the band theory, the predicted small FS pockets near the K points are absent. In addition, the band dispersion is found to be highly renormalized, and anisotropic along the two principal axes (Gamma-K, Gamma-M). Our measurements also indicate that an extended flatband is formed slightly above E(F) along Gamma-K.

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