https://doi.org/10.1051/epjap:2006123
Temperature dependence of critical currents of two-gap superconductors
1
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: hsahin@cumhuriyet.edu.tr
Received:
9
February
2006
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
