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A.c. susceptibility of melt-processed highTcsuperconductors

Authors
Journal
Cryogenics
0011-2275
Publisher
Elsevier
Publication Date
Volume
33
Issue
1
Identifiers
DOI: 10.1016/0011-2275(93)90091-2
Keywords
  • A.C. Susceptibility
  • Flux Flow
  • Magnetization Behaviour
Disciplines
  • Physics

Abstract

Abstract The force equilibrium equation including pinning, flux flow, flux creep and reversible flux line motion is used in order to calculate some properties of high T c superconductors connected with nonlinear flux diffusion. Some comparisons are made with experiments performed on melt-grown YBCO and melt-textured BSCCO as well as with results of the linear response theory. Our study shows that: (a) non-logarithmic relaxation is caused by flux flow; (b) interpretation of maxima in the imaginary part of a.c. susceptibility data as de-pinning lines seems to be questionable; (c) flux flow reduces the effects caused by the reversible flux line motion.

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