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Microwave frequency and power dependence of critical current in microbridges of BiSrCaCuO films

✍ Scribed by V.N. Ojha; V.S. Tomar; A.K. Gupta; D.K. Walia; G.S.N. Reddy; Neeraj Khare

Publisher: Elsevier Science
Year: 1990
Tongue: English
Weight: 414 KB
Volume: 165-166
Category: Article
ISSN: 0921-4526
DOI: 10.1016/s0921-4526(09)80389-x

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✦ Synopsis

Thick films of BiSrCaCuO superconductors are grown by spray pyrolysis technique. Annealed films are superconducting with Tc(O) at 83K. The microbridges of dimensions 120/-lm are scribed manually on these films. Application of microwave leads to the appearance of Shapiro steps. The frequency dependent study of critical current show a maxima for an optimum frequency. At this frequency, the critical current shows oscillatory decay with increasing microwave power. The above results indicate microwave absorption at the grain boundaries, leading to nucleation of vortices which eventually decay with increasing microwave power. 0.3

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