Direct observation of strong correlations near the band insulator regime of Bi misfit cobaltates

V. Brouet, A. Nicolaou, M. Zacchigna, A. Tejeda, L. Patthey, S. Hébert, Wataru Kobayashi, H. Muguerra, D. Grebille

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Abstract

We establish with angle-resolved photoemission spectroscopy (ARPES) that the electronic structure near the Fermi level of the "misfit" cobaltate [Bi2 Ba2 O4]·[Co O2] ∼2 is similar to that of Na cobaltates Nax Co O2. Both families of compounds contain triangular Co planes but in a different three-dimensional environment. We propose that the peculiar ARPES line shape of all cobaltates is of the "peak-dip-hump" type, due to strong many-body effects. We detect a progressive transfer of spectral weight from the quasiparticle feature near EF to a broad hump in misfit phases where Ba is replaced by Sr or Ca. This indicates stronger many-body interactions in proximity to the band insulator regime, which we attribute to the presence of unusual magnetic excitations.

Original languageEnglish
Article number100403
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume76
Issue number10
DOIs
Publication statusPublished - 2007 Sep 10
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics

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    Brouet, V., Nicolaou, A., Zacchigna, M., Tejeda, A., Patthey, L., Hébert, S., Kobayashi, W., Muguerra, H., & Grebille, D. (2007). Direct observation of strong correlations near the band insulator regime of Bi misfit cobaltates. Physical Review B - Condensed Matter and Materials Physics, 76(10), [100403]. https://doi.org/10.1103/PhysRevB.76.100403