WEIXA01
UVIC, Victoria, Canada
JLab, Newport News, Virginia, USA
TRIUMF, Vancouver, Canada
PSI, Villigen PSI, Switzerland
An electronic pre-print is available at https://arxiv.org/abs/2304.09360
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WEIXA01 |
Experimental Evidence for Current Suppression in Superconducting Hetero Structures | |
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Coating Nb with thin layers of superconductors of higher penetration depth, than Nb have been proposed as a means of obtaining accelerating gradients (Eacc) of beyond Nb’s fundamental limit. Such heterostructures (which can also contain insulating layers between the superconductors) can potentially sustain their Meissner state above the superheating field, Bsh (of all the layers) due to the suppression of the Meissner screening current in the surface layer(s) induced by a counter-current in the substrate layer. We report evidence for counter-current flow in superconductor- superconductor (SS) Nb-Ti-N/Nb samples from depth-resolved measurements of their Meissner screening profiles at applied fields below or equal to 25 mT using the low energy muon spin rotation (LE-muSR) technique. Fits to the London model with appropriate boundary and continuity conditions determine the penetration depth of the Nb-Ti-N layers to be 182.5(31) nm in good agreement with literature values. Our results suggest that due to the strong suppression of the Meissner currents in the surface layer, multilayered structures of several superconducting and insulating layers are necessary to reach highest Eacc.
An electronic pre-print is available at https://arxiv.org/abs/2304.09360 |
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Slides WEIXA01 [0.623 MB] | |
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