Angle-resolved photoemission study of the metal-insulator transition in bismuth cobaltates

Z. Yusof, B. O. Wells, T. Valla, P. D. Johnson, A. V. Fedorov, Q. Li, S. M. Loureiro, R. J. Cava

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3 Scopus citations

Abstract

We present an angle-resolved photoemission spectroscopy study of a Mott-Hubbard-type bismuth cobaltate system across a metal-insulator transition. By varying the amount of Pb substitution and by doping with Sr or Ba cation, a range of insulating to metallic properties is obtained. The electronic structure shows the emergence of a weakly dispersing state at the Fermi energy with increasing conductivity. A systematic change in the spectral weight of the coherent and incoherent parts, accompanied by an energy shift of the incoherent part, is also observed. The changes may be correlated with changes in the temperature-dependent resistivity. The nature of the coherent-incoherent components is compared to the peak-dip-hump feature seen in cuprate superconductors.

Original languageEnglish (US)
Article number165115
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume76
Issue number16
DOIs
StatePublished - Oct 15 2007

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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