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Measurements of the first-flux-penetration field in surface-treated and coated Nb: distinguishing between near-surface p...

Asaduzzaman, Md McFadden, Ryan M L Thoeng, Edward Laxdal, Robert E Junginger, Tobias

Published in Superconductor Science and Technology

We report measurements of the first-flux-penetration field in surface-treated and coated Nb samples using (μSR) . Using thin Ag foils as energy moderators for the implanted muon spin-probes, we ‘profile’ the vortex penetration field μ0Hvp at sub-surface depths on the order of ∼10μ m to ∼100μ m. In a coated sample [Nb3Sn( 2μm )/Nb], we find that μ0H...

Enhancement of the critical current by surface irregularities in Fe-based superconductors

Llovo, I F Mosqueira, J Hu, Ding Luo, Huiqian Li, Shiliang

Published in Superconductor Science and Technology

The critical current Ic of single crystals of the iron pnictide superconductor BaFe2(As 1−x P x )2 has been studied through measurements of magnetic hysteresis cycles. We show that the introduction of micrometer-scale irregularities on the surface significantly increases Ic , primarily near the irreversibility magnetic field Hirr . The observed inc...

Publication search with surface pinning as keyword

Measurements of the first-flux-penetration field in surface-treated and coated Nb: distinguishing between near-surface p...

Enhancement of the critical current by surface irregularities in Fe-based superconductors

Publication search
with surface pinning as keyword