Enhancement of the Meissner effect in single crystals of hysteretic type II superconductors by thermal cycling

Moh'd Rezeq, M. A.R. LeBlanc

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Abstract

The established model, which accounts for the magnetothermal behaviour of isotropic type II superconductors during slow cooling and warming below Tc in a static magnetic field, is extended to reproduce the observations of Hyun [Phys. Rev. B 48 (1993) 1244] of the enhancement of the magnitude of the diamagnetic magnetization Mg of Nb3Sn single crystals by thermal cycling between T1 and T2, where T1 ≪ T2 <Tc. The model also predicts that the thermal cycling between chosen T1 and T2 will lead to final closed hysteresis loops of Mg versus T. The structure of the final hysteresis loops and the corresponding sequences of configurations of magnetic flux prescribed by the model are also described.

Original languageBritish English
Pages (from-to)429-442
Number of pages14
JournalPhysica C: Superconductivity and its applications
Volume385
Issue number3
DOIs
StatePublished - 15 Mar 2003

Keywords

  • Critical state
  • Flux expulsion
  • Flux line pinning
  • Meissner effect
  • Thermomagnetic hysteresis

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