Infrared probe of the electronic structure and charge dynamics in Na${}_{0.7}$CoO${}_2$

Abstract

We present measurements of the optical spectra on Na${}_{0.7}$CoO${}_2$ single crystals. The optical conductivity shows two broad interband transition peaks at 1.6 eV and 3.2 eV, and a weak midinfrared peak at 0.4 eV. The intraband response of conducting carriers is different from that of a simple Drude metal. A peak at low but finite frequency is observed, which shifts to higher frequencies with increasing temperature, even though the dc resistivity is metallic. We discussed the origin of the interband transitions and the low-frequency charge dynamics based on the results of band structure calculations and quasiparticle behavior observed in ARPES experiment.

4 pages, 5 figures

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Cited by in corpus (29)

• Theory of universal incoherent metallic transport
• Diagrammatic routes to nonlocal correlations beyond dynamical mean field theory
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• Electron Correlation Driven Heavy-Fermion Formation in LiV2O4
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• The infrared conductivity of Na${}_x$CoO${}_2$: evidence of gapped states
• Enhancement of the Na${}_x$CoO${}_2$ thermopower due to electronic correlations
• Kinetically-controlled thin-film growth of layered $\beta$- and $\gamma -$Na${}_x$CoO${}_2$ cobaltate
• Optical Properties and Correlation Effects in NaxCoO2
• Electron-boson mode coupling and the pseudogap of Na${}_x$CoO${}_2$ by infrared spectroscopy
• Infrared Conductivity and Charge Ordering in NaCoO2
• Transient localization from the interaction with quantum bosons
• Optical Study of the Electronic Structure and Correlation Effects in K0.49RhO2
• Getting back to Na_xCoO_2: spectral and thermoelectric properties
• Considerable non-local electronic correlations in strongly doped Na${}_x$CoO${}_2$
• Localized versus itinerant magnetic moments in Na0.72CoO2
• Cooperative effect of phonons and electronic correlations for superconductivity in cobaltates
• Three dimensionality of band structure and a large residual quasiparticle population in Ba${}_{0.67}$K${}_{0.33}$Fe${}_2$As${}_2$ as revealed by the c-axis polarized optical measurement
• Quantum-Acoustical Drude Peak Shift
• From Hubbard bands to spin-polaron excitations in the doped Mott material Na${}_x$CoO${}_2$
• Realistic many-body approaches to materials with strong nonlocal correlations
• Effect of frustration on charge dynamics for a doped two-dimensional triangular Hubbard lattice: Comparison with a square lattice
• Infrared Hall conductivity of Na${}_{0.7}$CoO${}_2$
• Evolution of electron Fermi surface with doping in cobaltates
• Displaced Drude peak from $\pi$-ton vertex corrections
• Analytical expression for $\pi$-ton vertex contributions to the optical conductivity