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

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Etat: Public
Version: Final published version
ID Serval
serval:BIB_F539DD5BE612
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Optical evidence for the proximity to a spin-density-wave metallic state in Na0.7CoO2
Périodique
European Physical Journal B
Auteur(s)
Caimi G., Degiorgi L., Berger H., Barisic N., Forro L., Bussy F.
ISSN-L
1434-6028
Statut éditorial
Publié
Date de publication
2004
Peer-reviewed
Oui
Volume
40
Pages
231-234
Langue
anglais
Résumé
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.
Création de la notice
01/10/2012 20:07
Dernière modification de la notice
20/08/2019 17:21
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