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On the magnetic field dependence of critical current density in single crystals of high-Tc superconductors

✍ Scribed by K. Yamafuji; T. Fujiyoshi; K. Toko; T. Matsuno; T. Kobayashi; K. Kishio

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
849 KB
Volume
226
Category
Article
ISSN
0921-4534

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✦ Synopsis

The critical current density, J,, is discussed theoretically to explain the exponential dependence of .I, on the flux density, B, given typically by J,rexp( -B/B,( T) ), which has been widely observed for single crystals of high-T, superconductors in an external magnetic field parallel to the crystal c-axis. It is pointed out that J, shows an exponential-type dependence, J,aexp( -f(B, T) ), when the tilt modulus, C,,, of fluxoids shows a remarkable softening for higher values of the wave number. It is also shown that the present expression of J, is reduced to the observed B dependence off(B, T) -B/B,(T) by taking account of the effects of the layered crystal structure on C,, and the correlation length, ld4.

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✍ Ljiljana DobrosavljeviΔ‡-GrujiΔ‡; Zoran RadoviΔ‡ πŸ“‚ Article πŸ“… 1991 πŸ› Elsevier Science 🌐 English βš– 188 KB

It is shown, within a simple model calculation, that the critical current density of an S/N/S junction in a high paralel magnetic field decays exponentially. The comparison of the theoretical results with experimental data for the Pb/Cd/Pb junction and YBCO films is given.