{"paper":{"title":"Measurements of the first-flux-penetration field in surface-treated and coated Nb: Distinguishing between surface pinning and an interface energy barrier","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.supr-con","authors_text":"Edward Thoeng, Md Asaduzzaman, Robert E. Laxdal, Ryan M. L. McFadden, Tobias Junginger","submitted_at":"2024-02-23T18:49:14Z","abstract_excerpt":"We report measurements of the first-flux-penetration field in surface-treated and coated Nb samples using muon spin rotation ($\\mu$SR). Using thin Ag foils as energy moderators for the implanted muon spin-probes, we \"profile\" the vortex penetration field $\\mu_{0} H_{\\mathrm{vp}}$ at sub-surface depths on the order of $\\sim 10$ $\\mathrm{\\mu}$m to $\\sim 100$ $\\mathrm{\\mu}$m. In a coated sample [Nb$_3$Sn(2 $\\mathrm{\\mu}$m)/Nb], we find that $\\mu_{0} H_{\\mathrm{vp}}$ is depth-independent with a value of 234.5(35) mT, consistent with Nb's metastable superheating field and suggestive of surface ener"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2402.15500","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2402.15500/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}