Three-dimensional electronic structure in highly doped Na xCoO2 studied by angle-resolved photoemission spectroscopy

Toshiyuki Arakane, Takafumi Sato, Takashi Takahashi, Takenori Fujii, Atsushi Asamitsu

Research output: Contribution to journalArticlepeer-review

Abstract

We have investigated three-dimensional electronic structure for Na xCoO2 (x=0.77 and 0.65) by high-resolution angle-resolved photoemission spectroscopy to study the origin of antiferromagnetic (AF) transition of highly doped NaxCoO2 (x>0.75). The a 1g large hole-like Fermi surface (FS) in x=0.77 shows distinct three-dimensionality along the kz direction, and a three-dimensional small electron pocket appears around Γ point, indicating strong inter-layer electronic correlation. On the other hand, x=0.65 sample does not show three-dimensional behavior. This result indicates that transition of FS as a function of band filling is closely related to the occurrence of the magnetic transition in highly doped NaxCoO2.

Original languageEnglish
Pages (from-to)552-555
Number of pages4
JournalJournal of Physics and Chemistry of Solids
Volume72
Issue number5
DOIs
Publication statusPublished - 2011 May

Keywords

  • C. Photoelectron spectroscopy
  • D. Fermi surface
  • D. Spin-density waves

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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