Fermi surface evolution and Luttinger theorem in NaxCoO2: A systematic photoemission study

H. B. Yang, Z. H. Pan, A. K.P. Sekharan, T. Sato, S. Souma, T. Takahashi, R. Jin, B. C. Sales, D. Mandrus, A. V. Fedorov, Z. Wang, H. Ding

Research output: Contribution to journalArticlepeer-review

133 Citations (Scopus)

Abstract

We report a systematic angle-resolved photoemission study on NaxCoO2 for a wide range of Na concentrations (0.3≤x≤0.72). In all the metallic samples at different x, we observed (i) only a single holelike Fermi surface centered around Γ 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 eg′ 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.

Original languageEnglish
Article number146401
JournalPhysical review letters
Volume95
Issue number14
DOIs
Publication statusPublished - 2005 Sep 30

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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