{"paper":{"title":"Superfluid density measurements of Ba(CoxFe1-x)2As2 films near optimal doping","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.supr-con","authors_text":"C. B. Eom, C. W. Bark, D. C. Larbalestier, E. E. Hellstrom, J. D. Weiss, Jie Yong, J. Jiang, S. Lee, T. R. Lemberger","submitted_at":"2011-01-27T19:18:51Z","abstract_excerpt":"We report the first direct measurements of superfluid density, ns(T) \\propto {\\lambda}-2(T), in films of Fe-pnictide superconductors. The magnetic penetration depth, {\\lambda}(0), in our epitaxial, single-crystal Ba(CoxFe1-x)2As2 films near optimal doping (x=0.08) is 350 nm to 430 nm, comparable to bulk single crystals. The T-dependence of {\\lambda}-2 indicates a small s-wave gap, 2{\\Delta}(0)/kBTc = 2.2 \\pm 0.1. In detail, {\\lambda} has power-law behavior at low T: {\\lambda}(T)/{\\lambda}(0) - 1 \\approx 0.60*(T/Tc)2.5\\pm0.1. The small gap, together with power-law behavior at low T, suggests st"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1101.5363","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"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"}