Manifestation of multiband optical properties of MgB2

A. B. Kuz'menko, F. P. Mena, H. J.A. Molegraaf, D. Van Ver Marel, B. Gorshunov, M. Dressel, I. I. Mazin, J. Kortus, O. V. Dolgov, T. Muranaka, J. Akimitsu

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54 Citations (Scopus)

Abstract

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. σ1(ω) 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 σ-bands and the 3D π-bands have principally different impurity scattering rates and negligible interband scattering. This also explains a surprisingly small correlation between the defect concentration and Tc, expected for a two-gap superconductor. The large 3D carrier scattering rate suggests their proximity to the localization limit.

Original languageEnglish
Pages (from-to)479-484
Number of pages6
JournalSolid State Communications
Volume121
Issue number9-10
DOIs
Publication statusPublished - Mar 7 2002
Externally publishedYes

Keywords

  • D. Electron-phonon interactions
  • D. Optical properties of MgB
  • Superconductors

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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    Kuz'menko, A. B., Mena, F. P., Molegraaf, H. J. A., Van Ver Marel, D., Gorshunov, B., Dressel, M., Mazin, I. I., Kortus, J., Dolgov, O. V., Muranaka, T., & Akimitsu, J. (2002). Manifestation of multiband optical properties of MgB2. Solid State Communications, 121(9-10), 479-484. https://doi.org/10.1016/S0038-1098(02)00004-2