Magnetic relaxation and pinning in Ag/Bi(Pb)SCCO tapes: Deformation-induced effects

V. Beilin*, A. Goldgirsh, I. Felner, M. Schieber

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Magnetic hysteresis and magnetic relaxation in as-sintered and cold-pressed after sintering Ag/Bi-2223 tapes have been studied in the temperature range of 5-45 K for two field orientations: H∥c-axis and H∥ab-plane. Significantly higher effective pinning energy, Ueff, for H∥ab as compared to that for H∥c, is connected with the mechanism of intrinsic pinning for the vortex motion normal to the CuO2 atomic planes. Cold pressing results in the reduction of magnetization and transport inter-granular currents due to the introduction of additional weak links and microcracks into a sample. For the H∥c case the drastic drop in relaxation rate as well as the increase in the field of the first large scale vortex penetration, Hvp, was observed after cold pressing, indicating the enhancement of intra-granular and surface pinning by generated defects. Accordingly , the increase of Ueff in the limit of low currents was observed after cold pressing. Warm pressing which normally generates significantly lower concentration of residual defects than cold pressing, does not result in any inhibition of relaxation. For in-plane field H∥ab vortices penetration into a tape interior through microcracks is the dominating deformation-induced effect resulting in the acceleration of magnetic relaxation and the significant decrease of Ueff.

Original languageEnglish
Pages (from-to)416-423
Number of pages8
JournalSuperconductor Science and Technology
Volume10
Issue number6
DOIs
StatePublished - Jun 1997

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