https://doi.org/10.1007/s100510170191
Optical measurements of the superconducting gap in MgB2
1
1. Physikalisches Institut, Universität Stuttgart,
Pfaffenwaldring 57, 70550 Stuttgart, Germany
2
Laboratory of
Solid State Physics, Materials Science Centre, Nijenborgh 4, 9747
AG Groningen, The Netherlands
3
Department of Physics,
Aoyama-Gakuin University, 6-16-1 Chitsedai, Setagaya-ku, Tokyo
157, Japan
Corresponding author: a dressel@pi1.physik.uni-stuttgart.de
Received:
7
March
2001
Revised:
18
April
2001
Published online: 15 May 2001
Far-infrared reflectivity studies on the polycrystalline
intermetallic compound MgB2 with a superconducting transition
temperature 
K were performed at temperatures 20 K to
300 K. We observe a significant raise of the
superconducting-to-normal state reflectivity ratio below 
, with a maximum at about 
, which
gives a lower estimate of the superconducting gap of
meV.
PACS: 74.25.Gz – Optical properties / 74.70.Ad – Metals; alloys and binary compounds (including A15, Laves phases, etc.)
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2001
