{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:VOA7HKNVOB3OAI6IZWR5LCNUYF","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":"92030b5eedb01f32bf583e32e4652f57ba9f4309569923cae67ae966b4bf99b0","cross_cats_sorted":["cond-mat.str-el"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2009-03-13T19:53:11Z","title_canon_sha256":"aedfe93f72195776cd7c51eaad60408f5225d1a71c9539aa1d10d2c68e7e43d3"},"schema_version":"1.0","source":{"id":"0903.2470","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0903.2470","created_at":"2026-05-18T02:14:28Z"},{"alias_kind":"arxiv_version","alias_value":"0903.2470v1","created_at":"2026-05-18T02:14:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0903.2470","created_at":"2026-05-18T02:14:28Z"},{"alias_kind":"pith_short_12","alias_value":"VOA7HKNVOB3O","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_16","alias_value":"VOA7HKNVOB3OAI6I","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_8","alias_value":"VOA7HKNV","created_at":"2026-05-18T12:26:02Z"}],"graph_snapshots":[{"event_id":"sha256:7684d226715300fa1e221d6f43a5a741286a527bf20c191b0c11d9122f66f124","target":"graph","created_at":"2026-05-18T02:14:28Z","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 magnetic properties of a new family of molecular-based quasi-two dimension $S=1/2$ Heisenberg antiferromagnets are reported. Three compounds, ($Cu(pz)_2(ClO_4)_2$, $Cu(pz)_2(BF_4)_2$, and $[Cu(pz)_2(NO_3)](PF_6)$) contain similar planes of Cu$^{2+}$ ions linked into magnetically square lattices by bridging pyrazine molecules (pz = $C_4H_4N_2$). The anions provide charge balance as well as isolation between the layers. Single crystal measurements of susceptibility and magnetization, as well as muon spin relaxation studies, reveal low ratios of N\\'{e}el temperatures to exchange strengths ($4","authors_text":"C. Mielke, C. P. Landee, F. L. Pratt, F. M. Woodward, F. Xiao, M. M. Turnbull, N. Harrison, P. Babkevich, P. J. Baker, S. J. Blundell, T. Lancaster","cross_cats":["cond-mat.str-el"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2009-03-13T19:53:11Z","title":"2D XY Behavior observed in quasi-2D quantum Heisenberg antiferromagnets"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0903.2470","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:afc3584ee3ee18356daab5f2a7adea0106860ebd5fa111e13aa71ba8f901c147","target":"record","created_at":"2026-05-18T02:14:28Z","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":"92030b5eedb01f32bf583e32e4652f57ba9f4309569923cae67ae966b4bf99b0","cross_cats_sorted":["cond-mat.str-el"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2009-03-13T19:53:11Z","title_canon_sha256":"aedfe93f72195776cd7c51eaad60408f5225d1a71c9539aa1d10d2c68e7e43d3"},"schema_version":"1.0","source":{"id":"0903.2470","kind":"arxiv","version":1}},"canonical_sha256":"ab81f3a9b57076e023c8cda3d589b4c1546ef7a729beb4136f5c3b7d407d84fa","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ab81f3a9b57076e023c8cda3d589b4c1546ef7a729beb4136f5c3b7d407d84fa","first_computed_at":"2026-05-18T02:14:28.345888Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:14:28.345888Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"0A7WrvDysVWEiU9z5DExqY4+Nxbali6MV8YMf4ALHfeunIiCGbl2z4Ah0d2CDAv+BYVelIWGycAIjzC05klNAA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:14:28.346525Z","signed_message":"canonical_sha256_bytes"},"source_id":"0903.2470","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:afc3584ee3ee18356daab5f2a7adea0106860ebd5fa111e13aa71ba8f901c147","sha256:7684d226715300fa1e221d6f43a5a741286a527bf20c191b0c11d9122f66f124"],"state_sha256":"8b99fc6973c411229171ef765cdc04d7a73b2fc616d7e3824c31ebe254f39425"}