Flux dynamics and critical currents of high T-c tapes
Journal
Physica C-Superconductivity and Its Applications
Journal Volume
235-40
Pages
3417-3418
Date Issued
1994
Author(s)
Rosseel, K.
Metlushko, V.
Boon, W.
Dierickx, D.
Moshchalkov, V. V.
Bruynseraede, Y.
Van der Biest, O.
Abstract
We report on detailed measurements of the temperature and field variation of the critical current density Jc(T,H) and normalised relaxation rate S = d (ln M)/d(ln t) in (Bi, Pb)2Sr2Ca2Cu3Ox (Tc≈110 K) and (Tl,Pb,Bi)(Sr,Ba)2Cu3Ox (Tc≈119 K) silver-sheeted tapes with a critical current density Jc(T=5K,H=0T)≈ 105 A/cm2. For these tapes two different pinning regimes at T < 20 K have been found and characterised by the change of the slope in Jc(Tcr≈20 K). This anomaly is clearly observed in the wide field interval H ≤ 30kG. Comparison of Jc(T) and normalised relaxation rate S demonstrates that these materials are an intermediate case between single crystals and thin films. © 1994.
Type
journal article