Influence of experimental conditions on the electric field effect in the ceramic (BiPb)2Sr2Ca2Cu3Ox |
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Authors: | B I Smirnov T S Orlova A N Kudymov M T Lanagan N Chen K C Goretta |
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Institution: | (1) A. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia;(2) Argonne National Laboratory, Argonne, IL 60439, USA |
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Abstract: | An experimental study is reported of the influence of temperature (T), electric field polarity (±E), as well as of changes in the electrode/insulator/superconductor (E/I/S) measuring system on the field effect in the ceramic (BiPb)2Sr2Ca2Cu3Ox. It has been established that at 77 K and for E⩾60 MV/m the critical current I
c and conductivity of the sample increase for I>I
c, irrespective of the field polarity. For lower fields and a negative electrode potential the conductivity in an electric
field may decrease. The field effect decreases with increasing temperature, to practically vanish near T
c where the sample is still in superconducting state. Experiments carried out with more complex systems E/I/M/I/S and E/I/M/S (M stands for a metallic foil) support the conclusion that it is the external electric field that is responsible for the observed
effects.
Fiz. Tverd. Tela (St. Petersburg) 39, 1967–1970 (December 1997) |
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