Abstract
The effect of subdividing superconducting YBCO films on YSZ-buffered hastelloy substrates into arrays of parallel strips on the AC loss was investigated. Measurements of the loss component of the AC susceptibility, χ″, revealed that the frequency-independent hysteretic contribution to χ″, which is dominant at low frequencies ( f ≲ 1 kHz), decreased by a factor 1/ N when the film was subdivided into N parallel strips. As the strips were made wider or the separation between them made smaller, the hysteretic χ″ increased. The eddy current contribution to χ″, which originates from the metallic substrate, was found to become dominant with increasing frequency and approached a linear frequency dependence at high frequencies. The experimental findings are in close agreement with theoretical predictions of the AC loss in x-arrays of YBCO strips on metallic substrates.
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