{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:VJ22GHPEWZ7QP4M5PJSRNRPDKI","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":"fe2ed3c87dbdeacd4481fbc14421150af9651133b99548ff4a64eac83fce4ff4","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2013-08-22T13:52:27Z","title_canon_sha256":"f82ea127ed59bc12ea7d26b1c52c3014cbe36d8c350b259665f63f61d5e2fc85"},"schema_version":"1.0","source":{"id":"1308.4866","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1308.4866","created_at":"2026-05-18T03:05:08Z"},{"alias_kind":"arxiv_version","alias_value":"1308.4866v1","created_at":"2026-05-18T03:05:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1308.4866","created_at":"2026-05-18T03:05:08Z"},{"alias_kind":"pith_short_12","alias_value":"VJ22GHPEWZ7Q","created_at":"2026-05-18T12:28:04Z"},{"alias_kind":"pith_short_16","alias_value":"VJ22GHPEWZ7QP4M5","created_at":"2026-05-18T12:28:04Z"},{"alias_kind":"pith_short_8","alias_value":"VJ22GHPE","created_at":"2026-05-18T12:28:04Z"}],"graph_snapshots":[{"event_id":"sha256:058f365170f07b23bec2dfc153f24e9bc095af97cad56507dd3cc7b139ebfdff","target":"graph","created_at":"2026-05-18T03:05:08Z","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 on the microscopic magnetic modeling of the spin-1/2 copper mineral malachite at ambient and elevated pressures. Despite the layered crystal structure of this mineral, the ambient-pressure susceptibility and magnetization data can be well described by an unfrustrated quasi-one-dimensional magnetic model. Weakly interacting antiferromagnetic alternating spin chains are responsible for a large spin gap of 120K. Although the intradimer Cu-O-Cu bridging angles are considerably smaller than the interdimer angles, density functional theory (DFT) calculations revealed that the largest excha","authors_text":"Alexander A. Tsirlin, Helge Rosner, Oleg Janson, Stefan Lebernegg","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2013-08-22T13:52:27Z","title":"The spin gap in malachite Cu2(OH)2CO3 and its evolution under pressure"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1308.4866","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":"sha256:82f4d8744c956fb52eed2bddc0b331adcc54281850c3b4663a3931e98df3f586","target":"record","created_at":"2026-05-18T03:05:08Z","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":"fe2ed3c87dbdeacd4481fbc14421150af9651133b99548ff4a64eac83fce4ff4","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2013-08-22T13:52:27Z","title_canon_sha256":"f82ea127ed59bc12ea7d26b1c52c3014cbe36d8c350b259665f63f61d5e2fc85"},"schema_version":"1.0","source":{"id":"1308.4866","kind":"arxiv","version":1}},"canonical_sha256":"aa75a31de4b67f07f19d7a6516c5e352066b1a239129d6eebdd798bb791da779","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"aa75a31de4b67f07f19d7a6516c5e352066b1a239129d6eebdd798bb791da779","first_computed_at":"2026-05-18T03:05:08.466048Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:05:08.466048Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"tbcErwEJdsTw9qplu6kIMOWvtab53Vp7E6r3J36dKZh6A6KKKmew8GlE053TCo9S/I/Vq1G+FYPXSbxbWxHNAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T03:05:08.466824Z","signed_message":"canonical_sha256_bytes"},"source_id":"1308.4866","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:82f4d8744c956fb52eed2bddc0b331adcc54281850c3b4663a3931e98df3f586","sha256:058f365170f07b23bec2dfc153f24e9bc095af97cad56507dd3cc7b139ebfdff"],"state_sha256":"5260cc7c981810cf2aba1732da1157d52ee1ec4a70b0fba2059f85ac1e1e17e2"}