{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:SNVHZ42J75FZ7DQQY7OK2DQ57N","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":"d2cfd0b8498940ac25e37bd059d4ce89dcfdc7436ac7c6ae74c4bb1b1852f587","cross_cats_sorted":["cond-mat.str-el"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2010-01-11T16:24:13Z","title_canon_sha256":"98ae6412430184c37c7f71ef2ea19da0ae2b35ad95322bda273287973a9addd4"},"schema_version":"1.0","source":{"id":"1001.1689","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1001.1689","created_at":"2026-05-18T03:23:49Z"},{"alias_kind":"arxiv_version","alias_value":"1001.1689v2","created_at":"2026-05-18T03:23:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1001.1689","created_at":"2026-05-18T03:23:49Z"},{"alias_kind":"pith_short_12","alias_value":"SNVHZ42J75FZ","created_at":"2026-05-18T12:26:13Z"},{"alias_kind":"pith_short_16","alias_value":"SNVHZ42J75FZ7DQQ","created_at":"2026-05-18T12:26:13Z"},{"alias_kind":"pith_short_8","alias_value":"SNVHZ42J","created_at":"2026-05-18T12:26:13Z"}],"graph_snapshots":[{"event_id":"sha256:341d6124501abd34c78a7e72c8da0b72e6473a85b3c916dc148cf557a12af226","target":"graph","created_at":"2026-05-18T03:23:49Z","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 present the c-axis optical reflectance measurement on single crystals of BaFe$_2$As$_2$ and SrFe$_2$As$_2$, the parent compounds of FeAs based superconductors. Different from the ab-plane optical response where two distinct energy gaps were observed in the SDW state, only the smaller energy gap could be seen clearly for \\textbf{E}$\\parallel$c-axis. The very pronounced energy gap structure seen at a higher energy scale for \\textbf{E}$\\parallel$ab-plane is almost invisible. We propose a novel picture for the band structure evolution across the SDW transition and suggest different driving mech","authors_text":"B. Cheng, B. F. Hu, N. L. Wang, P. Zheng, R. H. Ruan, T. Dong, W. Z. Hu, X. Dai, Z. Fang, Z. G. Chen","cross_cats":["cond-mat.str-el"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2010-01-11T16:24:13Z","title":"Measurement of the c-axis optical reflectance of AFe$_2$As$_2$ (A=Ba, Sr) single crystals: Evidence of different mechanisms for the formation of two energy gaps"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1001.1689","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":"sha256:2234dda29caccf2cca677497ceff8ff7eb25dc1f753d0ed7f90d281f03125135","target":"record","created_at":"2026-05-18T03:23:49Z","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":"d2cfd0b8498940ac25e37bd059d4ce89dcfdc7436ac7c6ae74c4bb1b1852f587","cross_cats_sorted":["cond-mat.str-el"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2010-01-11T16:24:13Z","title_canon_sha256":"98ae6412430184c37c7f71ef2ea19da0ae2b35ad95322bda273287973a9addd4"},"schema_version":"1.0","source":{"id":"1001.1689","kind":"arxiv","version":2}},"canonical_sha256":"936a7cf349ff4b9f8e10c7dcad0e1dfb6cfcc76530446414415fbf1e4e0457c9","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"936a7cf349ff4b9f8e10c7dcad0e1dfb6cfcc76530446414415fbf1e4e0457c9","first_computed_at":"2026-05-18T03:23:49.549714Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:23:49.549714Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"QCAKBvDwXP3QgZ4AOEWeTufnLGR8J1n/nyZCCNxPzZBhz2vZ44T1XyhBETcLU8NsBiIi9svS8z8i5PP4GXJ6CQ==","signature_status":"signed_v1","signed_at":"2026-05-18T03:23:49.552336Z","signed_message":"canonical_sha256_bytes"},"source_id":"1001.1689","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2234dda29caccf2cca677497ceff8ff7eb25dc1f753d0ed7f90d281f03125135","sha256:341d6124501abd34c78a7e72c8da0b72e6473a85b3c916dc148cf557a12af226"],"state_sha256":"1f8253f643f35bf6c6203a381f3855852d274320709db9407da7766f6c15af5c"}