Evidence for transition of Fermi-surface topology in highly doped Na xCoO2

T. Arakane, T. Sato, T. Takahashi, T. Fujii, A. Asamitsu

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7 Citations (Scopus)


We have performed angle-resolved photoemission spectroscopy of Na xCoO2 (x=0.65 and 0.77) to clarify the origin of antiferromagnetic (AF) transition. We determined the electronic band structure along the out-of-plane direction by varying photon energy, and revealed that a three-dimensional electron pocket emerges at Γ point in the AF sample (x=0.77) while it is absent in the non-AF counterpart (x=0.65), showing the transition of Fermi-surface topology with the band filling. The present result suggests that the emergence of the electron pocket is closely related to the various anomalies of the physical properties in Na-rich cobaltates.

Original languageEnglish
Article number115132
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number11
Publication statusPublished - 2010 Mar 22

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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