@article{oai:niigata-u.repo.nii.ac.jp:00002057,
 author = {Yanagi, Yuki and Ono, Yoshiaki},
 issue = {12},
 journal = {Journal of Physics and Chemistry of Solids, Journal of Physics and Chemistry of Solids},
 month = {Dec},
 note = {Electronic states of the CoO2 plane in NaxCoO2 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 specifc heat coefficient γincreases 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.},
 pages = {3317--3320},
 title = {Effect of ferromagnetic spin fluctuations on the electronic states in NaxCoO2 based on two-dimensional triangular lattice 11-band d-p model},
 volume = {69},
 year = {2008}
}