Low-lying electronic structure of doped triangular cobaltates

Details Low-lying electronic structure of doped triangular cobaltates Low-lying electronic structure of doped triangular cobaltates

2006-05-11

arxiv.org/abs/cond-mat/0605289v1

J. Phys. Chem. of Solids 67, 235 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

Conference proceeding. SNS-2004, Spain

Scientific paper

10.1016/j.jpcs.2005.10.158

We report detailed Fermi surface topology and quasiparticle dynamics of the host cobaltate Na0.7CoO2. A direct mapping of the Fermi surface is carried out by angle-resolved photoemission spectroscopy (ARPES). Fermi surface at temperature 16K is a hole-pocket centered around the Gamma-point. The highly correlated nature of the electron liquid is evidenced from strong on-site Coulomb interaction seen through a valence satellite and via renormalization of the quasiparticle dispersion. The quasiparticle exhibits spectral coherence only below 150K which includes the non-Fermi liquid regime.

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