Eur. Phys. J. Appl. Phys.
Volume 36, Number 3, December 2006
|Page(s)||267 - 270|
|Section||Magnetism and Superconductivity|
|Published online||08 November 2006|
Temperature dependence of critical currents of two-gap superconductors
Department of Physics, Faculty of Science and Literature, Cumhuriyet
University, 58140 Sivas, Turkey
2 Department of Physics, Faculty of Sciences, Ankara University, 06100 Tandoğan, Ankara, Turkey and Institute of Physics, Azerbaijan National Academy of Sciences, Baku AZ1143, Azerbaijan
Corresponding author: firstname.lastname@example.org
Revised: 30 May 2006
Accepted: 30 August 2006
Published online: 8 November 2006
In this paper, we consider the two-gap Ginzburg-Landau (G-L) free energy functional including the interactions, and obtain a very simple and explicit formula which presents the relation between the critical current density and temperature. The result shows that the temperature dependence of critical current density of a two-gap superconductor is of the form Jc ∝ (Tc* − T)1/2 at low temperatures and Jc ∝ (Tc* − T)3/2 near the critical temperature. Our critical current density expression is in accord with the previous theoretical work and experimental data.
PACS: 74.20.De – Phenomenological theories (two-fluid, Ginzburg-Landau, etc.) / 74.25.Sv – Critical currents / 74.70.Ad – Metals; alloys and binary compounds (including A15, MgB2, etc.) / 74.70.Dd – Ternary, quaternary, and multinary compounds (including Chevrel phases, borocarbides, etc.)
© EDP Sciences, 2006
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