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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"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1101.5363","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2011-01-27T19:18:51Z","cross_cats_sorted":[],"title_canon_sha256":"08dd76e013827259240e36b3cf13ada4c16182b3daa904bebfba977d457d0226","abstract_canon_sha256":"e0acaac6adbd92790eae7f5736bd7282450c4416dc914d685567b6aaede04223"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:03:21.217847Z","signature_b64":"4oJ9SPN5U7ODcuwGmmS6cpaWTpsA+790O6+HhpavMwdu3KIqEoMpkNaQVF4HAJTagpLHrKVFMa71+XVj9hOsBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a9ccda7ec4658e406ef382d3344571ee3259fecf2ce117e19ef1deaadcfc9f3d","last_reissued_at":"2026-05-18T02:03:21.217157Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:03:21.217157Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"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. 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