Phase transitions in a Mg[B.sub.2] granular BCS superconductor in weak magnetic fields

The character of temperature dependences of the electric conductivity of Mg[B.sub.2] granular BCS superconductors at temperatures of ~35-45 K in external magnetic fields [H.sub.ext] of up to ~2 kOe is studied. An increase in the superconducting transition width [DELTA][T.sub.c] with an increase in [...

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Bibliographic Details
Published in:Physics of the solid state 2017-02, Vol.59 (2), p.229
Main Authors: Derevyanko, V.V, Sungurov, M.S, Sukhareva, T.V, Finkel, V.A, Shakhov, Yu.N
Format: Article
Language:English
Subjects:
College football
High temperature superconductors
Magnetic fields
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Summary:The character of temperature dependences of the electric conductivity of Mg[B.sub.2] granular BCS superconductors at temperatures of ~35-45 K in external magnetic fields [H.sub.ext] of up to ~2 kOe is studied. An increase in the superconducting transition width [DELTA][T.sub.c] with an increase in [H.sub.ext] is found. The presence of a system of weak links in MgB2-based granular superconductors is established. On the basis of experimental data, Mg[B.sub.2] granular superconductor is assigned to two-level superconducting systems and the H-T phase diagram is constructed.
ISSN:1063-7834
1090-6460
DOI:10.1134/S1063783417020056