Evidence for a two-band behavior of MgB 2 from point-contact and tunneling spectroscopy

• Published in: Solid state communications Vol. 129; no. 2; pp. 85 - 89
• Main Authors: Ponomarev, Ya.G., Kuzmichev, S.A., Mikheev, M.G., Sudakova, M.V., Tchesnokov, S.N., Timergaleev, N.Z., Yarigin, A.V., Maksimov, E.G., Krasnosvobodtsev, S.I., Varlashkin, A.V., Hein, M.A., Müller, G., Piel, H., Sevastyanova, L.G., Kravchenko, O.V., Burdina, K.P., Bulychev, B.M.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 2004
• Subjects: 74.20.−z; 74.50.+r; 74.70.Ad; D. Leggett's plasmon; D. Multiple Andreev reflections; D. Tunneling; D. Two-gap superconductivity; D. Two-gap superconductivity; 74.70.Ad; 74.20.−z; D. Leggett's plasmon; D. Tunneling; D. Multiple Andreev reflections; 74.50.+r
• ISSN: 0038-1098; 1879-2766
• DOI: 10.1016/j.ssc.2003.09.024

The break-junction tunneling has been systematically investigated in MgB 2. Two types of the break-junction contacts have been exploited on the same samples, which demonstrated tunnel contact like (SIS) and point contact like (SnS) behavior. Both of them have shown the existence of the two distinct energy gaps. We have also observed peculiarities on the I( V)- characteristics related to Leggett's collective mode assisted tunneling.