Physics – Condensed Matter – Superconductivity
Scientific paper
2004-11-24
Phys. Rev. B 71, 172508 (2005)
Physics
Condensed Matter
Superconductivity
11 pages, 1 figure
Scientific paper
10.1103/PhysRevB.71.172508
The effects of Al substitution and neutron irradiation on the conduction regime (clean or dirty) of the $\pi$- and $\sigma$-band of MgB$_{2}$ have been investigated by means of far-infrared spectroscopy. The intensity reflected by well characterized polycrystalline samples was measured up to 100 cm$^{- 1}$ in both normal and superconducting state. The analysis of the superconducting to normal reflectivity ratios shows that only the effect of the opening of the small gap in the dirty $\pi$-band can be clearly observed in pure MgB$_{2}$, consistently with previous results. In Al-doped samples the dirty character of the $\pi$-band is increased, while no definitive conclusion on the conduction regime of the $\sigma $-band can be drawn. On the contrary, results obtained for the irradiated sample show that the irradiation-induced disorder drives the $\sigma$-band in the dirty regime, making the large gap in $\sigma$-band observable for the first time in far-infrared measurements.
Castro Daniele Di
Dore P.
Monni Marco
Ortolani M.
Pallecchi Ilaria
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