Abstract
Detailed study of the electronic structure of the layered Na 0.7 CoO 2, doped Mott insulator with triangular Co lattice is performed by angle-resolved photoemission spectroscopy (ARPES). At low temperature Fermi surface is a centered hole pocket of hexagonal character shape in agreement with LDA. A broad valence band satellite at higher energies showing resonant enhancement at the 2p, 3p→3d excitations indicates large on-site Hubbard-U~5 eV . A momentum dependent quasiparticle band near Fermi level that is flat and vanished at energies already above 70 meV or 80 meV gives a value of the single particle hopping t<10 meV . This band is defined only in the region of non - Fermi liquid transport with linear growth of resistivity up to 120 K.
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