{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:VUWTP6X5HAOQAMOIQEYPNVMUGT","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":"324184245e33fde8de3a1c5c9cbf5f6a3c0db11dbed2a1b0c00d844cee79d17d","cross_cats_sorted":["cond-mat.mtrl-sci"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2009-09-15T08:19:09Z","title_canon_sha256":"37fa2c2bcd67c550b7f16117dcbb40f3f4d0a8aee69c0322f62bc51ad0981a63"},"schema_version":"1.0","source":{"id":"0909.2740","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0909.2740","created_at":"2026-05-18T04:22:48Z"},{"alias_kind":"arxiv_version","alias_value":"0909.2740v1","created_at":"2026-05-18T04:22:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0909.2740","created_at":"2026-05-18T04:22:48Z"},{"alias_kind":"pith_short_12","alias_value":"VUWTP6X5HAOQ","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_16","alias_value":"VUWTP6X5HAOQAMOI","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_8","alias_value":"VUWTP6X5","created_at":"2026-05-18T12:26:02Z"}],"graph_snapshots":[{"event_id":"sha256:baed14a9f27a9503cecb7cd23bdc37422980c49866040354b806da5766bf1cb1","target":"graph","created_at":"2026-05-18T04:22:48Z","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":"The iron arsenide RbFe_2As_2 with the ThCr_2Si_2-type structure is found to be a bulk superconductor with T_c=2.6 K. The onset of diamagnetism was used to estimate the upper critical field H_c2(T), resulting in dH_c2/dT=-1.4 T/K and an extrapolated H_c2(0)=2.5 T. As a new representative of iron pnictide superconductors, superconducting RbFe_2As_2 contrasts with BaFe_2As_2, where the Fermi level is higher and a magnetic instability is observed. Thus, the solid solution series (Rb,Ba)Fe_2As_2 is a promising system to study the crossover from superconductivity to magnetism.","authors_text":"B. Batlogg, J. Karpinski, R. Puzniak, S. Weyeneth, Z. Bukowski","cross_cats":["cond-mat.mtrl-sci"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2009-09-15T08:19:09Z","title":"Bulk Superconductivity at 2.6 K in Undoped RbFe_2As_2"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0909.2740","kind":"arxiv","version":1},"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":"sha256:775d8376a0de58476dacbdc5e7d8768fc76e2c31d36fde4d952a18941fedf74b","target":"record","created_at":"2026-05-18T04:22:48Z","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":"324184245e33fde8de3a1c5c9cbf5f6a3c0db11dbed2a1b0c00d844cee79d17d","cross_cats_sorted":["cond-mat.mtrl-sci"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2009-09-15T08:19:09Z","title_canon_sha256":"37fa2c2bcd67c550b7f16117dcbb40f3f4d0a8aee69c0322f62bc51ad0981a63"},"schema_version":"1.0","source":{"id":"0909.2740","kind":"arxiv","version":1}},"canonical_sha256":"ad2d37fafd381d0031c88130f6d59434e9a57df3b46cde690da18397e02a86bd","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ad2d37fafd381d0031c88130f6d59434e9a57df3b46cde690da18397e02a86bd","first_computed_at":"2026-05-18T04:22:48.950133Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:22:48.950133Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"yNyoQ4zvKVMBWzMvYsRVGYSined1JTpSVeWCJdBJPrR6unZM3/RlmYnlXq+S6xqgO2gi86OswZj08sZ5s1dZDA==","signature_status":"signed_v1","signed_at":"2026-05-18T04:22:48.950795Z","signed_message":"canonical_sha256_bytes"},"source_id":"0909.2740","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:775d8376a0de58476dacbdc5e7d8768fc76e2c31d36fde4d952a18941fedf74b","sha256:baed14a9f27a9503cecb7cd23bdc37422980c49866040354b806da5766bf1cb1"],"state_sha256":"948aacc45c3b5d16539bcec40797ec62790a5fa4ca34529840d3f6ffebdd67ae"}