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Modification of Structure and Properties of Superconducting YBaCuO Crystals by Combined Irradiations

Published online by Cambridge University Press:  18 March 2011

Elvira M. Ibragimova  and
Marquis A. Kirk
Elvira M. Ibragimova
Affiliation:
Institute of Nuclear Physics, Ulugbek, 702132, Tashkent, UZBEKISTAN
Marquis A. Kirk
Affiliation:
Material Science Division, Argonne National Laboratory, Argonne, IL, USA
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Abstract

Effects of electron irradiations in combination with 60Co gamma-quanta on magnetic properties of YBa2Cu3O7−x crystals have been studied to determine the contribution from oxygen defects to the pinning, and the condition of improving the critical parameter, Jc, of the crystals. Irradiation with 300 keV electrons followed by gamma-irradiation makes strong oxygen disorder, causing degradation of SC-transition and appearance of diamagnetic transition at 200 K, but no flux pinning in H>1 Tesla at 77 K. However, it is shown that oxygen defects do contribute substantially to the flux pinning at cation-anion defect clusters in CuO-planes created by moderate fluences of 1 MeV-electrons. A model is suggested for different oxygen and copper defects induced by the irradiations.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 659: Symposium II – High-Temperature Superconductors-Crystal Chemistry, Processing & Properties , 2000 , II7.8
Copyright
Copyright © Materials Research Society 2001

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References

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