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Fizika Tverdogo Tela, 2017 Volume 59, Issue 2, Pages 223–229 (Mi ftt9663)

This article is cited in 8 papers

Superconductivity

Phase transitions in a MgB$_{2}$ granular BCS superconductor in weak magnetic fields

V. V. Derevyanko, M. S. Sungurov, T. V. Sukhareva, V. A. Finkel, Yu. N. Shakhov

National Science Centre Kharkov Institute of Physics and Technology

Abstract: The character of temperature dependences of the electric conductivity of MgB$_{2}$ granular BCS superconductors at temperatures of $\sim$35–45 K in external magnetic fields H ext of up to $\sim$2 kOe is studied. An increase in the superconducting transition width $\Delta T_{c}$ with an increase in Hext is found. The presence of a system of weak links in MgB$_{2}$-based granular superconductors is established. On the basis of experimental data, MgB$_{2}$ granular superconductor is assigned to two-level superconducting systems and the $H$$T$ phase diagram is constructed.

Received: 10.05.2016
Revised: 28.06.2016

DOI: 10.21883/FTT.2017.02.44038.171


 English version:
Physics of the Solid State, 2017, 59:2, 229–235

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