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Phys Rev Lett. 2005 Sep 30;95(14):146401. Epub 2005 Sep 27.

Fermi surface evolution and Luttinger theorem in Na(x)CoO2: a systematic photoemission study.

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  • 1Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA.

Abstract

We report a systematic angle-resolved photoemission study on Na(x)CoO2 for a wide range of Na concentrations (0.3 < or = x < or = 0.72). In all the metallic samples at different x, we observed (i) only a single holelike 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) 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.

PMID:
16241674
[PubMed]
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