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

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

2003-12-24

arxiv.org/abs/cond-mat/0312630v2

Phys. Rev. Lett. 93, 237007 (2004), minor changes made

Physics

Condensed Matter

Superconductivity

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.93.237007

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.

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