Phase transitions in a MgB2 granular BCS superconductor in weak magnetic fields

被引：0
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作者：
V. V. Derevyanko
M. S. Sungurov
T. V. Sukhareva
V. A. Finkel’
Yu. N. Shakhov
机构：
[1] National Academy of Sciences of Ukraine,National Science Center Kharkov Institute of Physics and Technology
来源：
Physics of the Solid State | 2017年 / 59卷
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摘要：
The character of temperature dependences of the electric conductivity of MgB2 granular BCS superconductors at temperatures of ~35–45 K in external magnetic fields Hext of up to ~2 kOe is studied. An increase in the superconducting transition width ΔTc with an increase in Hext is found. The presence of a system of weak links in MgB2-based granular superconductors is established. On the basis of experimental data, MgB2 granular superconductor is assigned to two-level superconducting systems and the H–T phase diagram is constructed.
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页码：229 / 235
页数：6
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