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| VOLUME 85 (2007) | ISSUE 1 | PAGE 52 |
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Leggett's Mode in Mg1-xAlxB2
Ya. G. Ponomarev, S. A. Kuzmichev, M. G. Mikheev, M. V. Sudakova, S. N. Tchesnokov, Hoang Hoai Van, B. M. Bulychev+, E. G. Maksimov*, S. I. Krasnosvobodtsev*
Faculty of Physics, Moscow State University, 119899 Moscow, Russian Federation +Faculty of Chemistry, Moscow State University, 119899 Moscow, Russian Federation *P.N. Lebedev Institute of Physics RAS, 117924 Moscow, Russian Federation PACS: 74.45.+c, 74.50.+r, 74.70.Ad
Abstract
A detailed investigation of multiband superconductivity and Leggett's mode in the Mg1-xAlxB2  system was
carried out using tunneling and Andreev spectroscopy. Temperature
dependences of superconducting gaps Δσ and
Δπ and their
variation upon the degree of disorder and the Al concentration were studied.
The dependence of the Leggett's mode energy  upon the values
of the gaps Δσ and Δπ has been derived.
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