Infrared Probe of the Electronic Structure and Charge Dynamics ofNa0.7CoO2

2003/12/31 by N. L. Wang, P. Zheng, D. Wu +9 · 5 citations
Materials Science · Physics and Astronomy · #Advanced Thermoelectric Materials and Devices #Atomic physics #Charge (physics) #Charge carrier #Condensed matter physics #Electrical resistivity and conductivity #Infrared #Magnetic and transport properties of perovskites and related materials #Materials science #Metal #Optical conductivity #Optics #Particle physics #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Spectral line #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevlett.93.237007

published as Phys. Rev. Lett. 93, 237007 (2004), minor changes made · 4 pages, 5 figures

arxiv created 2004/05/15 · openalex publication_date 2004/12/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

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 3.1 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. The origin of the interband transitions and the low-frequency charge dynamics have been discussed and compared with other experiments.

Citations

• Crystal structure of the sodium cobaltate deuterate superconductorNaxCoO2⋅4xD2O(x≈13)
• Optical conductivity of single crystals ofNa0.57CoO2
• First-principles lattice dynamics ofNaCoO2
• Unconventional upper- and lower-critical fields and normal-state magnetic susceptibility of the superconducting compoundNa0.35CoO2⋅1.3H2O
• Ferromagnetic In-Plane Spin Fluctuations inNaxCoO2Observed by Neutron Inelastic Scattering
• Charge transport of electron-doped Mott insulators on a triangular lattice
• ARPES onNa0.6CoO2: Fermi Surface and Unusual Band Dispersion
• Charge Ordering, Commensurability, and Metallicity in the Phase Diagram of the LayeredNaxCoO2

Cited by

• Cooperative effect of phonons and electronic correlations for superconductivity in cobaltates
• Optical conductivity and charge ordering inNaxCoO2
• Suppression of thermal conductivity by rattling modes in thermoelectric sodium cobaltate
• From Hubbard bands to spin-polaron excitations in the doped Mott materialNaxCoO2
• Infrared conductivity ofNaxCoO2: Evidence of gapped states