{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:JUM2I6HT5FYQKTWHCZMZ5HWTJM","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":"9be96546cba44de6f165df0875c61467b4bdf36bee20b9269175185ca382b48a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2010-04-09T00:01:39Z","title_canon_sha256":"e1de258b9bb45fcf2934cfb743e43fe48276caf0ba04708dd17e3b2c4d16329f"},"schema_version":"1.0","source":{"id":"1004.1445","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1004.1445","created_at":"2026-05-18T04:42:44Z"},{"alias_kind":"arxiv_version","alias_value":"1004.1445v2","created_at":"2026-05-18T04:42:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1004.1445","created_at":"2026-05-18T04:42:44Z"},{"alias_kind":"pith_short_12","alias_value":"JUM2I6HT5FYQ","created_at":"2026-05-18T12:26:09Z"},{"alias_kind":"pith_short_16","alias_value":"JUM2I6HT5FYQKTWH","created_at":"2026-05-18T12:26:09Z"},{"alias_kind":"pith_short_8","alias_value":"JUM2I6HT","created_at":"2026-05-18T12:26:09Z"}],"graph_snapshots":[{"event_id":"sha256:af2850eac2fd1644c48b4a37e59f4649668b449603c8e4e1da1f04f55667d252","target":"graph","created_at":"2026-05-18T04:42:44Z","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 have systematically investigated the doping and the directional dependence of the gap structure in the 122-type iron pnictide superconductors by point contact Andreev reflection spectroscopy. The studies were performed on single crystals of Ba1-xKxFe2As2 (x = 0.29, 0.49, and 0.77) and SrFe1.74Co0.26As2 with a sharp tip of Pb or Au pressed along the c-axis or the ab-plane direction. The conductance spectra obtained on highly transparent contacts clearly show evidence of a robust superconducting gap. The normalized curves can be well described by the Blonder-Tinkham-Klapwijk model with a life","authors_text":"Ichiro Takeuchi, Johnpierre Paglione, Kee Hoon Kim, Kevin Kirshenbaum, Liqin Yan, Nicholas P. Butch, Richard L. Greene, Shanta R. Saha, Xiaohang Zhang, Yong Liu, Yoon Seok Oh","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2010-04-09T00:01:39Z","title":"Evidence of a universal and isotropic 2\\Delta/kBTC ratio in 122-type iron pnictide superconductors over a wide doping range"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1004.1445","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:dfbc94f6632aa6bf0bd7b4fd9e5c4ae57b04d0ae579ac1687f215706a406ddc8","target":"record","created_at":"2026-05-18T04:42:44Z","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":"9be96546cba44de6f165df0875c61467b4bdf36bee20b9269175185ca382b48a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2010-04-09T00:01:39Z","title_canon_sha256":"e1de258b9bb45fcf2934cfb743e43fe48276caf0ba04708dd17e3b2c4d16329f"},"schema_version":"1.0","source":{"id":"1004.1445","kind":"arxiv","version":2}},"canonical_sha256":"4d19a478f3e971054ec716599e9ed34b2284d9e78f119057c3c4f39f9c72b15b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4d19a478f3e971054ec716599e9ed34b2284d9e78f119057c3c4f39f9c72b15b","first_computed_at":"2026-05-18T04:42:44.517211Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:42:44.517211Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"A8eGxGoCeAA8Pp3HWBxqUE+/8WzpUyKT7uUFai3un7ts09z4ZHMRahwhKm0mEl295j4bTOY1BmQro3jCjrHBCg==","signature_status":"signed_v1","signed_at":"2026-05-18T04:42:44.517838Z","signed_message":"canonical_sha256_bytes"},"source_id":"1004.1445","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:dfbc94f6632aa6bf0bd7b4fd9e5c4ae57b04d0ae579ac1687f215706a406ddc8","sha256:af2850eac2fd1644c48b4a37e59f4649668b449603c8e4e1da1f04f55667d252"],"state_sha256":"9f0692375675a8ad0ed4979a2391e1f5eac751c83340665f0251df7b951d3d1b"}