Optical evidence for the proximity to a spin-density-wave metallic state in Na0.7CoO2

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State: Public
Version: Final published version
Serval ID
serval:BIB_F539DD5BE612
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Optical evidence for the proximity to a spin-density-wave metallic state in Na0.7CoO2
Journal
European Physical Journal B
Author(s)
Caimi G., Degiorgi L., Berger H., Barisic N., Forro L., Bussy F.
ISSN-L
1434-6028
Publication state
Published
Issued date
2004
Peer-reviewed
Oui
Volume
40
Pages
231-234
Language
english
Abstract
We present the optical properties of Na0.7CoO2 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) at low temperatures and for
similar to omega. This suggests that Na0.7CoO2 is at the verge of a
spin-density-wave metallic phase.
Create date
01/10/2012 20:07
Last modification date
20/08/2019 17:21
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