Temperature dependence of the vortex pinning enhancement by γ irradiation of Bi1.6Pb0.4Sr2Ca2Cu3O10 polycrystals

M. K. Hasan, B. A. Albiss, I. M. Obaidat, S. J. Park, J. S. Kouvel

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18 Citations (Scopus)


The saturation remanent magnetization MRS, taken to represent the vortex pinning strength, was measured at various temperatures from 4.2 K up to near Tc on two similarly prepared polycrystalline samples of B1.6Pb0.4Sr2Ca2Cu3O10 (BPSCCO), one of which had been subsequently γ-irradiated. For both samples, the decrease of MRS with rising temperature (T) is found to consist of two distinct components, one of which varies linearly with t (= 1-T/Tc) up to Tc, and the other decays very rapidly, essentially as tβ with β just under 10. The γ irradiation is seen to produce a threefold enhancement of the linear-t component, but its major effect is a 10-fold enhancement of the exponential-tbeta component. The direct connection between MRS and the vortex pinning strength is tested and confirmed by sample-rotational magnetization measurements. Hence, the MRS component whose temperature decay is exponentially rapid can be attributed to a thermal decoupling of vortices from localized pinning sites. The pronounced irradiation-enhancement of this component thus implies that the defects produced by the γ-rays are acting primarily as vortex pinning sites that are effectively very restricted in size.

Original languageEnglish
Pages (from-to)75-79
Number of pages5
JournalPhysica C: Superconductivity and its applications
Issue number1
Publication statusPublished - Jul 1 2000
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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