Ya. G. Ponomarev, S. A. Kuzmichev, N. M. Kadomtseva, M. G. Mikheev, M. V. Sudakova, S. N. Chesnokov, E. G. Maksimov, S. I. Krasnosvobodtsev, L. G. Sevast'yanova, K. P. Burdina, B. M. Bulychev, “Investigation of a superconducting Mg1−xAlxB2 system by tunneling and microjunction (Andreev) spectroscopies”, Pis'ma v Zh. Èksper. Teoret. Fiz., 2004, Volume 79, Issue 10,Pages 597

This article is cited in 28 papers

CONDENSED MATTER

Investigation of a superconducting Mg_1−xAl_xB₂ system by tunneling and microjunction (Andreev) spectroscopies

Ya. G. Ponomarev^a, S. A. Kuzmichev^a, N. M. Kadomtseva^a, M. G. Mikheev^a, M. V. Sudakova^a, S. N. Chesnokov^a, E. G. Maksimov^b, S. I. Krasnosvobodtsev^b, L. G. Sevast'yanova^c, K. P. Burdina^c, B. M. Bulychev^c

^a M. V. Lomonosov Moscow State University, Faculty of Physics
^b P. N. Lebedev Physical Institute, Russian Academy of Sciences
^c M. V. Lomonosov Moscow State University, Department of Chemistry

Abstract: A detailed investigation of multiband superconductivity in the Mg _1−xAl_xB₂ system was carried out by the methods of tunneling and Andreev spectroscopy. Temperature dependences of the superconducting gaps and their variation upon an increase in the degree of disorder and the Al concentration were studied. It is shown that the experimentally observed dependences cannot be explained in detail within the framework of the presently available microscopic theories.

PACS: 74.20.Fg, 74.62.-c, 74.70.Dd

Received: 07.04.2004