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          Institute: MPI für Festkörperforschung     Collection: FKF Publikationen 2002     Display Documents



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ID: 7363.0, MPI für Festkörperforschung / FKF Publikationen 2002
Manifestation of multiband optical properties of MgB2
Authors:Kuz'menko, A. B.; Mena, F. P.; Molegraaf, H. J. A.; van der Marel, D.; Gorshunov, B.; Dressel, M.; Mazin, I. I.; Kortus, J.; Dolgov, O. V.; Muranaka, T.; Akimitsu, J.
Language:English
Date of Publication (YYYY-MM-DD):2002
Title of Journal:Solid State Communications
Volume:121
Issue / Number:9-10
Start Page:479
End Page:484
Review Status:Peer-review
Audience:Not Specified
Abstract / Description:The optical conductivity of MgB2 has been determined on a dense
polycrystalline sample in the spectral range 6 meV-4.6 eV using
a combination of ellipsometric and normal incidence
reflectivity measurements. sigma(1)(w) features a narrow Drude
peak with anomalously small plasma frequency (1.4 eV) and a
very broad 'dome' structure, which comprises the bulk of the
low-energy spectral weight. This fact can be reconciled with
the results of band structure calculations by assuming that
charge carriers from the 2D sigma-bands and the 3D pi-bands
have principally different impurity scattering rates and
negligible interband scattering. This also explains a
surprisingly small correlation between the defect concentration
and T-c, expected for a two-gap superconductor. The large 3D
carrier scattering rate suggests their proximity to the
localization limit. (C) 2002 Elsevier Science Ltd. All rights
reserved.
Free Keywords:optical properties of MgB2; electron-phonon interactions;
superconductors
External Publication Status:published
Document Type:Article
Communicated by:Michaela Asen-Palmer
Affiliations:MPI für Festkörperforschung
External Affiliations:; Univ Groningen, Ctr Mat Sci, Nijenborgh 4, NL-9747 AG Groningen, Netherlands
; Univ Stuttgart, Inst Phys, D-70550 Stuttgart, Germany
; USN, Res Lab, Ctr Computat Mat Sci, Washington, DC 20375 USA
; Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany
; Aoyama Gakuin Univ, Dept Phys, Setagaya Ku, Tokyo 157, Japan
Identifiers:ISI:000174753200006
ISSN:0038-1098
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