title: Anisotropic drude response and the effect of anisotropic C substitution in.
abstract: The in-plane and the out-of-plane optical spectra of small single crystals of Mg(B1-xCx)2 were directly determined by a microscope spectroscopy technique. Contrary to previous reports, the estimated plasma frequencies for both directions are quite consistent with the band calculation. A multi-Drude picture corresponding to a multiband system is necessary to explain the whole spectral profile. The spectral changes with the carbon substitution indicate a decrease of carrier concentration as well as an increase of scattering rate, particularly, in the sigma bands.
authors.affiliation: Superconductivity Research Laboratory, ISTEC, Shinonome 1-10-13, Koto-ku, Tokyo 135-0062, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Kakeshita
authors.forename: S
authors.initials: S
authors.lastname: Lee
authors.forename: S
authors.initials: S
authors.lastname: Tajima