Ya. G. Ponomarev, S. A. Kuzmichev, M. G. Mikheev, M. V. Sudakova, S. N. Chesnokov, H. V. Hoang, B. M. Bulychev, E. G. Maksimov, S. I. Krasnosvobodtsev, “Leggett's Mode in Mg$_{1-x}$Al$_x$B$_2$”, Pis'ma v Zh. Èksper. Teoret. Fiz., 2007, Volume 85, Issue 1,Pages 52

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CONDENSED MATTER

Leggett's Mode in Mg$_{1-x}$Al$_x$B$_2$

Ya. G. Ponomarev^a, S. A. Kuzmichev^a, M. G. Mikheev^a, M. V. Sudakova^a, S. N. Chesnokov^a, H. V. Hoang^a, B. M. Bulychev^b, E. G. Maksimov^c, S. I. Krasnosvobodtsev^c

^a Faculty of Physics, Moscow State University
^b Faculty of Chemistry, Moscow State University
^c P. N. Lebedev Institute of Physics RAS

Abstract: A detailed investigation of multiband superconductivity and Leggett's mode in the Mg$_{1-x}$Al$_x$B$_2$ $(0\leq x\leq0.45)$ system was carried out using tunneling and Andreev spectroscopy. Temperature dependences of superconducting gaps $\Delta_\sigma$ and $\Delta_\pi$ and their variation upon the degree of disorder and the Al concentration were studied. The dependence of the Leggett's mode energy $\varepsilon_0$ upon the values of the gaps $\Delta_\sigma$ and $\Delta_\pi$ has been derived.

PACS: 74.45.+c, 74.50.+r, 74.70.Ad

Received: 21.11.2006

Language: English