Two-band parallel conductivity at terahertz frequencies in the superconducting state of MgB$_2$.

Details Two-band parallel conductivity at terahertz frequencies in the superconducting state of MgB$_2$. Two-band parallel conductivity at terahertz frequencies in the superconducting state of MgB$_2$.

2008-01-21

arxiv.org/abs/0801.3197v1

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures

Scientific paper

10.1103/PhysRevB.77.100507

The optical response of the two-band superconductor MgB$_2$ has been studied in the 0.7-4 THz range on films with very low impurity level. The effect of the high-energy $\sigma$-gap is observed in the ratio $R_S/R_N$ between the normal and superconducting state reflectance, while in a neutron irradiated film with a slightly higher impurity level mainly the effect of the $\pi$-gap is evident as reported in previous experiments. At terahertz frequencies, the electrodynamic of MgB$_2$ can be well described by the two-band parallel conductivity model and is dominated by the $\pi$-bands when the impurity level is only slightly higher than that of an ultra-clean sample.

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