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Evidence for a two-band behavior of MgB2 from point-contact and tunneling spectroscopy |
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| Authors: | Ya.G. Ponomarev,S.A. Kuzmichev,M.V. Sudakova,N.Z. Timergaleev,E.G. Maksimov,A.V. Varlashkin,G. Mü ller,L.G. Sevastyanova,K.P. Burdina |
| Affiliation: | a Department of Physics, M. V. Lomonosov Moscow State University, Vorobyovi Gori, 119899 Moscow, Russian Federation b P. N. Lebedev Physics Institute, RAS, Moscow, Russian Federation c Bergische Universität Wuppertal, Fachbereich Physik, D-42097 Wuppertal, Germany d Department of Chemistry, M. V. Lomonosov Moscow State University, 119899 Moscow, Russia |
| Abstract: | The break-junction tunneling has been systematically investigated in MgB2. 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. |
| Keywords: | 74.20.&minus z 74.50.+r 74.70.Ad |
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