Fermi surface evolution and Luttinger theorem in Na$_x$CoO$_2$: a systematic photoemission study

Details Fermi surface evolution and Luttinger theorem in Na$_x$CoO$_2$: a systematic photoemission study Fermi surface evolution and Luttinger theorem in Na$_x$CoO$_2$: a systematic photoemission study

2005-01-17

arxiv.org/abs/cond-mat/0501403v1

Phys. Rev. Lett. 95, 146401 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.95.146401

We report a systematic angle-resolved photoemission study on Na$_x$CoO$_2$ for a wide range of Na concentrations ($0.3 \leq x \leq 0.72$). In all the metallic samples at different $x$, we observed (i) only a single hole-like Fermi surface centered around $\Gamma$ and (ii) its area changes with $x$ according to the Luttinger theorem. We also observed a surface state that exhibits a larger Fermi surface area. The $e_g^\prime$ band and the associated small Fermi surface pockets near the $K$ points predicted by band calculations are found to ``sink'' below the Fermi energy in a manner almost independent of the doping and temperature.

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