Effect of ferromagnetic spin fluctuations on the electronic states in Nax CoO2 based on two-dimensional triangular lattice 11-band d-p model

Yuki Yanagi, Yoshiaki Ono

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Electronic states of the CoO2 plane in Nax CoO2 are investigated on the basis of the triangular lattice 11-band d-p model by using the second order perturbation (SOP) and the random phase approximation (RPA). Due to the effect of the in-plane ferromagnetic fluctuations enhanced for 0.6 ≲ x ≲ 0.75, the quasiparticle dispersion near the Γ-point is strongly reduced to yield an almost flat dispersion just above the fermi level. With increasing x, the electronic specific heat coefficient γ increases towards the critical doping xc ∼ 0.75 above which the in-plane ferromagnetism takes place. We also find that the six small hole pockets near the K-point are stabilized due to the electron correlation effect within both the SOP and the RPA.

Original languageEnglish
Pages (from-to)3317-3320
Number of pages4
JournalJournal of Physics and Chemistry of Solids
Volume69
Issue number12
DOIs
Publication statusPublished - 2008 Dec
Externally publishedYes

Keywords

  • A. Metals
  • A. Oxides
  • D. Magnetic properties
  • D. Specific heat
  • D. Thermodynamic properties

ASJC Scopus subject areas

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

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