Experimental evidence of two-band behavior of MgB2
Ya. G. Ponomarev, S. A. Kuzmichev, M. G. Mikheev, M. V. Sudakova, S., N. Tchesnokov, N. Z. Timergaleev, A. V. Yarigin, E. G. Maksimov, S. I., Krasnosvobodtsev, A. V. Varlashkin, M. A. Hein, G. Muller, H. Piel, L. G., Sevastyanova, O. V. Kravchenko, K. P. Burdina, B. M. Bulychev
TL;DR
This study provides experimental evidence for two distinct energy gaps in MgB2 using break-junction tunneling, revealing two-band superconductivity and Leggett's mode in the material.
Contribution
It demonstrates the coexistence of two energy gaps in MgB2 through systematic tunneling experiments on different junction types.
Findings
Identification of two energy gaps in MgB2
Observation of Leggett's collective mode features
Confirmation of two-band superconductivity
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 observed also the peculiarities on the I(V)- characteristics related to Leggett's collective mode assisted tunneling. --> Corresponding author address: [email protected]
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