The Fermi surface of NaₓCoO₂
Zhang, Peihong · Luo, Weidong · Cohen, Marvin L. · Louie, Steven G.
Original · EN
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.
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