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Optical measurements of the superconducting gap in MgB 2 |
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| Authors: | B Gorshunov CA Kuntscher P Haas M Dressel FP Mena AB Kuz'menko D van der Marel T Muranaka J Akimitsu |
| Institution: | 1. Physikalisches Institut, Universit?t Stuttgart, Pfaffenwaldring 57, 70550, Stuttgart, Germany Laboratory of Solid State Physics, Materials Science Centre, Nijenborgh 4, 9747AG, Groningen, The Netherlands Department of Physics, Aoyama-Gakuin University, 6-16-1 Chitsedai, Setagaya-ku, Tokyo 157, Japan |
| Abstract: | Far-infrared reflectivity studies on the polycrystalline intermetallic compound MgB2 with a superconducting transition temperature T c = 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. Received 7 March 2001 and Received in final form 18 April 2001 |
| Keywords: | PACS 74 25 Gz Optical properties – 74 70 Ad Metals alloys and binary compounds (including A15 Laves phases etc ) |
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