{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:3I4K5LFPL7AB3FJQJUABYCJ5V3","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"74464f77efbcd18d4f356f93a6e9da2db0dd3be8386cdee007a972e0b76cfa32","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2010-03-02T11:50:53Z","title_canon_sha256":"8b5cccddfd6a3495b08bcb87381f539101eed7dedcddfb96a4fb90db44be2d58"},"schema_version":"1.0","source":{"id":"1003.0565","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1003.0565","created_at":"2026-05-18T04:38:17Z"},{"alias_kind":"arxiv_version","alias_value":"1003.0565v3","created_at":"2026-05-18T04:38:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1003.0565","created_at":"2026-05-18T04:38:17Z"},{"alias_kind":"pith_short_12","alias_value":"3I4K5LFPL7AB","created_at":"2026-05-18T12:26:03Z"},{"alias_kind":"pith_short_16","alias_value":"3I4K5LFPL7AB3FJQ","created_at":"2026-05-18T12:26:03Z"},{"alias_kind":"pith_short_8","alias_value":"3I4K5LFP","created_at":"2026-05-18T12:26:03Z"}],"graph_snapshots":[{"event_id":"sha256:6a7ff79982a0d00fdaa0390d7f31e1564bfddb3e70452af7b944d6f5d9739812","target":"graph","created_at":"2026-05-18T04:38:17Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"We measured the THz reflectance properties of a high quality epitaxial thin film of the Fe-based superconductor BaFe$_{1.84}$Co$_{0.16}$As$_2$ with T$_c$=22.5 K. The film was grown by pulsed laser deposition on a DyScO$_3$ substrate with an epitaxial SrTiO$_3$ intermediate layer. The measured $R_S/R_N$ spectrum, i.e. the reflectivity ratio between the superconducting and normal state reflectance, provides clear evidence of a superconducting gap $\\Delta_A$ close to 15 cm$^{-1}$. A detailed data analysis shows that a two-band, two-gap model is absolutely necessary to obtain a good description of","authors_text":"A. Perucchi, C.B. Eom, C. Marini, C.W. Bark, E.E. Hellstrom, I. Pallecchi, J.D. Weiss, J. Jiang, L. Baldassarre, M. Putti, P. Dore, S. Lee, S. Lupi","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2010-03-02T11:50:53Z","title":"Multi-gap superconductivity in a BaFe1.84Co0.16As2 film from optical measurements at terahertz frequencies"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1003.0565","kind":"arxiv","version":3},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:b5715f51e73f0038b99768bcaf880c8f34e3b85c1c7449930ce56114a5259e49","target":"record","created_at":"2026-05-18T04:38:17Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"74464f77efbcd18d4f356f93a6e9da2db0dd3be8386cdee007a972e0b76cfa32","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2010-03-02T11:50:53Z","title_canon_sha256":"8b5cccddfd6a3495b08bcb87381f539101eed7dedcddfb96a4fb90db44be2d58"},"schema_version":"1.0","source":{"id":"1003.0565","kind":"arxiv","version":3}},"canonical_sha256":"da38aeacaf5fc01d95304d001c093daed6d39ddda0e59c340ec06c994986d4ee","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"da38aeacaf5fc01d95304d001c093daed6d39ddda0e59c340ec06c994986d4ee","first_computed_at":"2026-05-18T04:38:17.176331Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:38:17.176331Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"dTBR9mge7ii6fnBd9TnzpqLq5RF5eEvac+XfEz3xQCKGw8JiSQWAg4ohSv9BRecp+fD0Ch9+nM/fXQREYhRGCw==","signature_status":"signed_v1","signed_at":"2026-05-18T04:38:17.176808Z","signed_message":"canonical_sha256_bytes"},"source_id":"1003.0565","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b5715f51e73f0038b99768bcaf880c8f34e3b85c1c7449930ce56114a5259e49","sha256:6a7ff79982a0d00fdaa0390d7f31e1564bfddb3e70452af7b944d6f5d9739812"],"state_sha256":"8e2b9a1fec768ccd043d6b3827c15d291af5267e0b3d409250b681fdbbcf503f"}