Angle-resolved photoemission spectroscopy (ARPES) of Na 0.7CoO2

Alexander Kuprin, MD Zahid Hasan, Yi De Chuang, Zahid Hussain, Dong Qian, M. Foo, Robert Joseph Cava

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish (US)
Pages (from-to)345-351
Number of pages7
JournalInternational Journal of Modern Physics B
Volume19
Issue number1-3
DOIs
StatePublished - Jan 3 2005

All Science Journal Classification (ASJC) codes

  • Statistical and Nonlinear Physics
  • Condensed Matter Physics

Keywords

  • Cobalt oxyhydrates
  • Electron correlations
  • Mott insulator
  • Photoelectron spectroscopy

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