Temperature and magnetic field dependence of critical currents in granular superconductors

Author

Costabile, G. ; De Luca, R. ; Pace, S. ; Saggese, A. ; Testa, A.M.

Author_Institution

Dept. of Phys., Salerno Univ., Italy

Volume

5

Issue

2

fYear

1995

fDate

6/1/1995 12:00:00 AM

Firstpage

1395

Lastpage

1398

Abstract

We analyze the critical current density J/sub c/ of a two-dimensional granular superconductor by a Josephson junction network approach, taking into account shielding current effects. We show that the temperature and field dependence of J/sub c/ is not directly given by the corresponding dependences of the maximum Josephson current of a single junction. By a critical state picture we discuss the temperature and magnetic field dependence of the effective energy barrier U/sub /spl gamma// for flux motion in the array. From the knowledge of U/sub /spl gamma//, calculated in the presence of currents flowing through the junctions, the magnetic field and temperature dependence of the critical current is derived.<>

Keywords

Josephson effect; critical current density (superconductivity); flux flow; high-temperature superconductors; Josephson junction network approach; critical current density; critical currents; flux motion; granular superconductors; high temperature superconductors; magnetic field dependence; shielding current effects; temperature dependence; two-dimensional granular superconductor; Critical current; Critical current density; Energy barrier; Granular superconductors; Josephson effect; Josephson junctions; Magnetic analysis; Magnetic fields; Magnetic shielding; Temperature dependence;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.402825

Filename

402825