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

N. L. Wang, P. Zheng, D. Wu +4

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…