ISSN:
1063-7834
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract An experimental study is reported of the effect of an electric field E⩽120 MV/m and of temperature T on the critical current I c and I-V characteristics of yttrium-based high-T c superconducting ceramics. The materials studied were copper-deficient ceramics, YBa2Cu3−x Oy (D samples), and YBa2Cu3−x Oy/Agx ceramics [S samples with silver present in amounts equal to the copper deficiency (0⩽x⩽0.4)]. It has been established that in D samples at 77 K, the electric field increases I c and reduces substantially R for I〉I c, whereas in S samples no field effect is observed. Measurements of the I c(T) dependence near the critical temperature showed that they can be described for all samples by a relation of the type I c =const(1−T/T c )α, where α≈1 for the D samples, and α≈2 for the S samples. The results obtained suggest that the electric-field effect correlates with the existence in the ceramic of SIS-type weak links at grain boundaries.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1134/1.1130493
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