Doping evolution of the Fermi surface topology of NaxCoO2 is studied systematically. Both local density approximation (LDA) and local spin density approximation (LSDA) predict a large Fermi surface as well as small hole pockets for doping levels x∼ 0.5. In contrast, the hole pockets are completely absent for all doping levels within LSDA+U. More importantly, we find no violation of Luttinger's rule in this system, contrary to a recent suggestion. The measured Fermi surface of Na0.7CoO2 can be explained by its half-metallic behavior and agrees with our LSDA+U calculations.
@article{arxiv.cond-mat/0410596,
title = {The Fermi surface of Na$_{x}$CoO$_2$},
author = {Peihong Zhang and Weidong Luo and Marvin L. Cohen and Steven G. Louie},
journal= {arXiv preprint arXiv:cond-mat/0410596},
year = {2007}
}