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Manifestation of multiband optical properties of MgB2

Published inSolid state communications, vol. 121, no. 9-10, p. 479-484
Publication date2002-03

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.

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KUZMENKO, Alexey et al. Manifestation of multiband optical properties of MgB<sub>2</sub>. In: Solid state communications, 2002, vol. 121, n° 9-10, p. 479–484. doi: 10.1016/S0038-1098(02)00004-2
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ISSN of the journal0038-1098

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