Low-lying electronic structure of doped triangular cobaltates

Abstract

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.

Conference proceeding. SNS-2004, Spain

References in corpus (6)

• Angle-resolved photoemission spectroscopy of the cuprate superconductors
• Spin entropy as the likely source of enhanced thermopower in $\rm\bf Na_xCo_2O_4
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• Specific-heat evidence for strong electron correlations in the thermoelectric material (Na,Ca)Co_{2}O_{4}
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Cited by in corpus (1)

• One-particle spectral properties of the t-J-$V$ model on the triangular lattice near charge order