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Voltage‐current characteristics of Bi‐2223 superconducting tape near T c under γ irradiation
Author(s) -
Kayed T. S.,
Ercan I.
Publication year - 2004
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.200310179
Subject(s) - superconductivity , irradiation , condensed matter physics , magnetic field , critical current , materials science , voltage , atmospheric temperature range , current (fluid) , analytical chemistry (journal) , transition temperature , chemistry , physics , thermodynamics , nuclear physics , chromatography , quantum mechanics
Voltage‐current characteristics at four different applied magnetic fields (7, 20, 30, and 40 mT) of Bi 2 Sr 2 Ca 2 Cu 3 O x superconducting tape were measured in the temperature range from 100 to 115 K. They were also measured at zero magnetic field before and after γ irradiations up to 10 MRad at different temperatures just below the critical temperature. The data were fitted to a power law expression V = I β(T) in which the exponential parameter β under 20 mT field and after irradiation is found to fluctuate around three and then drops to unity near the critical temperature which may be interpreted as a sign of Kosterlitz‐Thouless transition. The electrical properties of the tape were found to be very sensitive to γ irradiation where most of the changes take place in low γ doses. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)