Clean and dirty superconductivity in pure, Al-doped, and neutron irradiated MgB2: A far-infrared study
M. Ortolani, D. Di Castro, P. Postorino, I. Pallecchi, M. Monni, M. Putti, P. Dore
DOI 10.1103/PhysRevB.71.172508 · Physical Review B
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Abstract
The effects of Al substitution and neutron irradiation on the conduction regime (clean or dirty) of the π and σ band of MgB2 have been investigated by means of far-infrared spectroscopy. The intensity reflected by well characterized polycrystalline samples was measured up to 100cm−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 π band can be clearly observed in pure MgB2, consistently with previous results. In Al-doped samples the dirty character of the π band is increased, while no definitive conclusion on the conduction regime of the σ band can be drawn. On the contrary, results obtained for the irradiated sample show that the irradiation-induced disorder drives the σ band in the dirty regime, making the large gap in σ band observable in far-infrared measurements.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38.5 | Pressure unresolved | unknown |
| Mg0.85Al0.15B2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 31 | Pressure unresolved | unknown |
| Mg0.7Al0.3B2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 21 | Pressure unresolved | unknown |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 35.5 | Pressure unresolved | unknown |
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