{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:FIW47ELLP6MPJJSUEMOICTLCPL","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":"d84cc775deccbc459797743c670005182bb33e04d6921d751dc3032e5ec1fa40","cross_cats_sorted":["cond-mat.str-el"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2010-07-21T15:08:44Z","title_canon_sha256":"b6ec2c9cff22472684813d95bfbd3d335d8570084fcc93c72060c625a3e1107a"},"schema_version":"1.0","source":{"id":"1007.3677","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1007.3677","created_at":"2026-05-18T03:14:17Z"},{"alias_kind":"arxiv_version","alias_value":"1007.3677v2","created_at":"2026-05-18T03:14:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1007.3677","created_at":"2026-05-18T03:14:17Z"},{"alias_kind":"pith_short_12","alias_value":"FIW47ELLP6MP","created_at":"2026-05-18T12:26:07Z"},{"alias_kind":"pith_short_16","alias_value":"FIW47ELLP6MPJJSU","created_at":"2026-05-18T12:26:07Z"},{"alias_kind":"pith_short_8","alias_value":"FIW47ELL","created_at":"2026-05-18T12:26:07Z"}],"graph_snapshots":[{"event_id":"sha256:4caa5fef50462e1a61ce977e9bb648d8f05bfdcd7393861c9f52e0e9e6c7de01","target":"graph","created_at":"2026-05-18T03:14:17Z","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 report a study of high quality pnictide superconductor BaFe$_{1.84}$Co$_{0.16}$As$_2$ thin films using time-domain THz spectroscopy. Near T$_c$ we find evidence for a coherence peak and qualitative agreement with the weak-coupling Mattis-Bardeen form of the conductivity. At low temperature, we find that the real part of the THz conductivity is not fully suppressed and $\\sigma_2$ is significantly smaller than the Matthis-Bardeen expectation. The temperature dependence of the penetration depth $\\lambda$ follows a power law with an unusually high exponent of 3.1. We interpret these results as ","authors_text":"C.B. Eom, D.C. Larbalestier, E.E. Hellstrom, J.D. Weiss, J. Jiang, L.S. Bilbro, N.P. Armitage, R. Vald\\'es Aguilar, S. Lee","cross_cats":["cond-mat.str-el"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2010-07-21T15:08:44Z","title":"Observation of a coherence peak and pair-breaking effects in THz conductivity of BaFe$_{2-2x}$Co$_{2x}$As$_2$"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1007.3677","kind":"arxiv","version":2},"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":"sha256:254dfa880f18f196d04c2fcf1bc99971827c0e1c25054334c8da4b0bba9b2382","target":"record","created_at":"2026-05-18T03:14:17Z","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":"d84cc775deccbc459797743c670005182bb33e04d6921d751dc3032e5ec1fa40","cross_cats_sorted":["cond-mat.str-el"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2010-07-21T15:08:44Z","title_canon_sha256":"b6ec2c9cff22472684813d95bfbd3d335d8570084fcc93c72060c625a3e1107a"},"schema_version":"1.0","source":{"id":"1007.3677","kind":"arxiv","version":2}},"canonical_sha256":"2a2dcf916b7f98f4a654231c814d627adeb15c7b7e6029ba0e7e041c5f3fc2fa","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2a2dcf916b7f98f4a654231c814d627adeb15c7b7e6029ba0e7e041c5f3fc2fa","first_computed_at":"2026-05-18T03:14:17.864226Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:14:17.864226Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"bVAcwQ2jgiD0BggnRBrJJWDI+WPhUgS4c9ak3W3r4YzvDtk+5VRxVaGzRfH0hqe5Xr5PjxZz9iR6r6dhpsCkBA==","signature_status":"signed_v1","signed_at":"2026-05-18T03:14:17.864916Z","signed_message":"canonical_sha256_bytes"},"source_id":"1007.3677","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:254dfa880f18f196d04c2fcf1bc99971827c0e1c25054334c8da4b0bba9b2382","sha256:4caa5fef50462e1a61ce977e9bb648d8f05bfdcd7393861c9f52e0e9e6c7de01"],"state_sha256":"0629eb446b5e4f7c386ac42b7fb98d410663fa8f66ac992cd4c387b1820177b1"}