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Flux dynamics in (Y, Nd)1Ba2Cu3O7−δ superconductors

Published online by Cambridge University Press:  23 December 2010

A. S. Mahmoud ,
J. Horvat  and
S. X. Dou
A. S. Mahmoud*
Affiliation:
Department of Physics, Faculty of Science, Al-Fateh University, P.O. Box, 13220 Tripoli, Libya
J. Horvat
Affiliation:
Institute of Superconducting and Electronic Materials, University of Wollongong, NSW, 2522 Wollongong, Australia
S. X. Dou
Affiliation:
Institute of Superconducting and Electronic Materials, University of Wollongong, NSW, 2522 Wollongong, Australia
*
[email protected]
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Abstract

The vortex dynamics of (Y, Nd)Ba2Cu3O7−δ ((Y, Nd)123) superconductors have been studied using magnetic relaxation measurements obtained at different sweep rates. The temperature dependence of the dynamic relaxation rate (Q) is found to be not vanishing at T = 0 K, and also showed well developed maxima becoming broader and tending to move to higher temperatures with decreasing magnetic field. At temperatures close to the critical temperature (T c ), Q(T) showed well-developed minima becoming deeper and tending to move to lower temperatures with increasing field. These minima appeared to occur approximately at the same reduced temperature position [ T/T c ]as that of oxygen-controlled-melt-grown (OCMG)-Nd(123) samples, thus providing further support for pinning similarities between both systems. Both the field dependence of the characteristic pinning energy [ U c ]and relaxation rate showed significant inconsistency with the collective pinning theory but full agreement with the results of [Perkins et al., Phys. Rev. B 54, 12551 (1996)].

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 53 , Issue 1 , January 2011 , 10801
Copyright
© EDP Sciences, 2010

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