Optical evidence for the proximity to a spin-density-wave metallic state in Na$_{0.7}$CoO$_2$

Details Optical evidence for the proximity to a spin-density-wave metallic state in Na$_{0.7}$CoO$_2$ Optical evidence for the proximity to a spin-density-wave metallic state in Na$_{0.7}$CoO$_2$

2004-04-16

arxiv.org/abs/cond-mat/0404400v1

Eur. Phys. J. B 40, 231 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1140/epjb/e2004-00275-9

We present the optical properties of \na single crystals, measured over a broad spectral range as a function of temperature ($T$). The capability to cover the energy range from the far-infrared up to the ultraviolet allows us to perform reliable Kramers-Kronig transformation, in order to obtain the absorption spectrum (i.e., the complex optical conductivity). To the complex optical conductivity we apply the generalized Drude model, extracting the frequency dependence of the scattering rate ($\Gamma$) and effective mass ($m^*$) of the itinerant charge carriers. We find that $\Gamma(\omega)\sim \omega$ at low temperatures and for $\omega > T$. This suggests that \na is at the verge of a spin-density-wave metallic phase.

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