The Fermi surface of Na$_{x}$CoO$_2$

Details The Fermi surface of Na$_{x}$CoO$_2$ The Fermi surface of Na$_{x}$CoO$_2$

2004-10-23

arxiv.org/abs/cond-mat/0410596v1

Phys. Rev. Lett. 93, 236402 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevLett.93.236402

Doping evolution of the Fermi surface topology of Na$_x$CoO$_2$ 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 $x\sim$ 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 Na$_{0.7}$CoO$_2$ can be explained by its half-metallic behavior and agrees with our LSDA+U calculations.

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