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Evidence of current stabilization after long-time decay in high-TCsuperconductors

Authors
Journal
Cryogenics
0011-2275
Publisher
Elsevier
Publication Date
Volume
45
Issue
2
Identifiers
DOI: 10.1016/j.cryogenics.2004.07.001
Keywords
  • Flux Creep
  • Superconducting Vortex
  • Superconducting Rings
Disciplines
  • Physics

Abstract

Abstract In this work, we have studied flux creep phenomenon over a long time period viz. about 1.5 × 10 7 s (i.e. for six months) at liquid nitrogen temperature. For this purpose, a high current was induced in four high- T C superconducting rings by means of a field-cooling (one sample) or a ferromagnetic field-cooling procedure (three samples). The resulting current decay was measured using a Hall probe system and the results obtained revealed lower relaxation rates in the ferromagnetic field-cooled samples. Also, the experimental data were found to leave the prediction of the classical Anderson–Kim model after a time long enough. The slope of the logarithmic current decay plot exhibited an oscillatory phenomenon at approximately 2 × 10 5 s (about 55 h). Oscillations vanished at approximately 4–5 × 10 6 s (46–58 days), after which the induced current remained stable throughout the remainder of the experiencing period.

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