Physics – Condensed Matter – Superconductivity
Scientific paper
2001-07-04
Solid State Communications 121, 479-484 (2002)
Physics
Condensed Matter
Superconductivity
RevTeX, 4 pages, 5 figures
Scientific paper
10.1016/S0038-1098(02)00004-2
The optical conductivity of MgB$_2$ 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. $\sigma_{1}(\omega)$ 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.
Akimitsu Jun
der Marel Dirk van
Dolgov Oleg V.
Dressel Martin
Gorshunov Boris
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