Optical measurements of the superconducting gap in MgB2
Gorshunov, B. · Kuntscher, C. A. · Haas, P. · Dressel, M. · Mena, F. P. · Kuz'menko, A. B. · van der Marel, D. · Muranaka, T. · Akimitsu, J.
Original · EN
Far-infrared reflectivity studies on the polycrystalline intermetallic compound MgB₂ with a superconducting transition temperature Tc=39 K were performed at temperatures 20 K to 300 K. We observe a significant raise of the superconducting-to-normal state reflectivity ratio below 70 cm⁻¹, with a maximum at about 25-30 cm⁻¹, which gives a lower estimate of the superconducting gap of 2Δ(0)≈3-4 meV.
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