Optical measurements of the superconducting gap in MgB2

Authors
Gorshunov, B Kuntscher, CA Haas, P Dressel, M Mena, FP Kuz'menko, AB van der Marel, D Muranaka, T Akimitsu, J
Citation
B. Gorshunov et al., Optical measurements of the superconducting gap in MgB2, EUR PHY J B, 21(2), 2001, pp. 159-161
Citations number
19
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
EUROPEAN PHYSICAL JOURNAL B
ISSN journal
14346028 → ACNP
Volume
21
Issue
2
Year of publication
2001
Pages
159 - 161
Database
ISI
SICI code
1434-6028(200105)21:2<159:OMOTSG>2.0.ZU;2-7
Abstract
Far-infrared reflectivity studies on the polycrystalline intermetallic comp ound MgB2 with a superconducting transition temperature T-c = 39 K were per formed 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 supercon ducting gap of 2 Delta (0)approximate to 3-4 meV.