Two-band parallel conductivity at terahertz frequencies in the superconducting state of MgB2
M. Ortolani, P. Dore, D. Di Castro, A. Perucchi, S. Lupi, V. Ferrando, M. Putti, I. Pallecchi, C. Ferdeghini, X. X. Xi
DOI 10.1103/PhysRevB.77.100507 · Physical Review B
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Abstract
The optical response of the two-band superconductor MgB2 has been studied in the 0.7–4THz range on films with very low impurity level. The effect of the high-energy σ gap is observed in the ratio RS∕RN between the normal and superconducting state reflectance, while in a neutron irradiated film with a slightly higher impurity level, mainly the effect of the π gap is evident, as reported in previous experiments. At terahertz frequencies, the electrodynamics of MgB2 can be well described by the two-band parallel conductivity model and is dominated by the π bands when the impurity level is only slightly higher than that of an ultraclean sample.
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. | 41 | Pressure not reported | unknown |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 40.3 | Pressure not reported | unknown |
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