The electronic structure of superconducting Na0.6CoO2 was studied by angle-resolved photoelectron spectroscopy (ARPES). The high-quality single crystals were grown using the floating-zone method. The valence band was measured at a number of photon energies, ranging from 16-110 eV. The results show that the measured Fermi surfaces (FS) are consistent with large FS enclosing the γ point from the band theory.
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