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ANGLE-RESOLVED PHOTOEMISSION SPECTROSCOPY (ARPES) OF Na_0.7CoO₂

ALEXANDER KUPRIN

Joseph Henry Laboratories, Department of Physics, Princeton University, Princeton, NJ 08544, USA

Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA

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ZAHID HASAN

Joseph Henry Laboratories, Department of Physics, Princeton University, Princeton, NJ 08544, USA

Princeton Center for Complex Materials, Princeton Materials Institute, Princeton, NJ 08544, USA

Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA

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YI-DE CHUANG

Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA

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ZAHID HUSSAIN

Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA

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DONG QIAN

Joseph Henry Laboratories, Department of Physics, Princeton University, Princeton, NJ 08544, USA

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M. FOO

Department of Chemistry, Princeton University, Princeton, NJ 08544, USA

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, and

R. J. CAVA

Department of Chemistry, Princeton University, Princeton, NJ 08544, USA

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https://doi.org/10.1142/S0217979205028554Cited by:0 (Source: Crossref)

Abstract

Detailed study of the electronic structure of the layered Na_0.7CoO₂, 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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