Abstract
Flux pinning characteristics have been investigated for the Nb x Ti100-x /Nb(x = 65, 50 and 28) and Nb 28 Ti 72/Nb 65 Ti 35 superconductor(S)/superconductor(S′) multilayers. The maximum of the pinning force F p⊥ max perpendicular to the layer plane as a function of the structure modulation length λ has a peak in the quasi-two-dimensional region (λ∼20 nm). The maximum. values of the F p⊥ max versus λ curve are proportional to the difference of the GL coherence length (ξ GL ) between the superconductive sublayers S and S′. The results suggest that the large F p⊥ max in the S/S′ multilayer is caused by the repulsive pinning force due to Nb layers with larger ξ GL .
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Obi, Y., Ikebe, M. & Fujishiro, H. Repulsive Flux Pinning Force in NbTi/Nb Superconductor/Superconductor Multilayers. Journal of Low Temperature Physics 137, 125–137 (2004). https://doi.org/10.1023/B:JOLT.0000044239.59812.06
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DOI: https://doi.org/10.1023/B:JOLT.0000044239.59812.06