Low-lying electronic structure of doped triangular cobaltates
A. P. Kuprin, D. Qian, Y.-D. Chuang, M. Foo, R. J. Cava, M. Z. Hasan
TL;DR
This paper uses ARPES to map the Fermi surface and quasiparticle behavior of doped triangular cobaltates, revealing strong correlations, a hole-pocket Fermi surface, and temperature-dependent coherence effects.
Contribution
It provides detailed experimental insights into the electronic structure and correlation effects in doped cobaltates, highlighting temperature-dependent quasiparticle coherence.
Findings
Fermi surface is a hole-pocket around Gamma-point at 16K
Strong on-site Coulomb interactions observed
Quasiparticle coherence persists below 150K
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.
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