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

研究成果: Article査読

28 被引用数 (Scopus)

抄録

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.

本文言語English
論文番号100403
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
76
10
DOI
出版ステータスPublished - 2007 9 10
外部発表はい

ASJC Scopus subject areas

  • Condensed Matter Physics

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