{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2013:VJ22GHPEWZ7QP4M5PJSRNRPDKI","short_pith_number":"pith:VJ22GHPE","schema_version":"1.0","canonical_sha256":"aa75a31de4b67f07f19d7a6516c5e352066b1a239129d6eebdd798bb791da779","source":{"kind":"arxiv","id":"1308.4866","version":1},"attestation_state":"computed","paper":{"title":"The spin gap in malachite Cu2(OH)2CO3 and its evolution under pressure","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.str-el","authors_text":"Alexander A. Tsirlin, Helge Rosner, Oleg Janson, Stefan Lebernegg","submitted_at":"2013-08-22T13:52:27Z","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"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1308.4866","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2013-08-22T13:52:27Z","cross_cats_sorted":[],"title_canon_sha256":"f82ea127ed59bc12ea7d26b1c52c3014cbe36d8c350b259665f63f61d5e2fc85","abstract_canon_sha256":"fe2ed3c87dbdeacd4481fbc14421150af9651133b99548ff4a64eac83fce4ff4"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:05:08.466824Z","signature_b64":"tbcErwEJdsTw9qplu6kIMOWvtab53Vp7E6r3J36dKZh6A6KKKmew8GlE053TCo9S/I/Vq1G+FYPXSbxbWxHNAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"aa75a31de4b67f07f19d7a6516c5e352066b1a239129d6eebdd798bb791da779","last_reissued_at":"2026-05-18T03:05:08.466048Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:05:08.466048Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The spin gap in malachite Cu2(OH)2CO3 and its evolution under pressure","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.str-el","authors_text":"Alexander A. Tsirlin, Helge Rosner, Oleg Janson, Stefan Lebernegg","submitted_at":"2013-08-22T13:52:27Z","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"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1308.4866","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"aliases":[{"alias_kind":"arxiv","alias_value":"1308.4866","created_at":"2026-05-18T03:05:08.466173+00:00"},{"alias_kind":"arxiv_version","alias_value":"1308.4866v1","created_at":"2026-05-18T03:05:08.466173+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1308.4866","created_at":"2026-05-18T03:05:08.466173+00:00"},{"alias_kind":"pith_short_12","alias_value":"VJ22GHPEWZ7Q","created_at":"2026-05-18T12:28:04.890932+00:00"},{"alias_kind":"pith_short_16","alias_value":"VJ22GHPEWZ7QP4M5","created_at":"2026-05-18T12:28:04.890932+00:00"},{"alias_kind":"pith_short_8","alias_value":"VJ22GHPE","created_at":"2026-05-18T12:28:04.890932+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/VJ22GHPEWZ7QP4M5PJSRNRPDKI","json":"https://pith.science/pith/VJ22GHPEWZ7QP4M5PJSRNRPDKI.json","graph_json":"https://pith.science/api/pith-number/VJ22GHPEWZ7QP4M5PJSRNRPDKI/graph.json","events_json":"https://pith.science/api/pith-number/VJ22GHPEWZ7QP4M5PJSRNRPDKI/events.json","paper":"https://pith.science/paper/VJ22GHPE"},"agent_actions":{"view_html":"https://pith.science/pith/VJ22GHPEWZ7QP4M5PJSRNRPDKI","download_json":"https://pith.science/pith/VJ22GHPEWZ7QP4M5PJSRNRPDKI.json","view_paper":"https://pith.science/paper/VJ22GHPE","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1308.4866&json=true","fetch_graph":"https://pith.science/api/pith-number/VJ22GHPEWZ7QP4M5PJSRNRPDKI/graph.json","fetch_events":"https://pith.science/api/pith-number/VJ22GHPEWZ7QP4M5PJSRNRPDKI/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/VJ22GHPEWZ7QP4M5PJSRNRPDKI/action/timestamp_anchor","attest_storage":"https://pith.science/pith/VJ22GHPEWZ7QP4M5PJSRNRPDKI/action/storage_attestation","attest_author":"https://pith.science/pith/VJ22GHPEWZ7QP4M5PJSRNRPDKI/action/author_attestation","sign_citation":"https://pith.science/pith/VJ22GHPEWZ7QP4M5PJSRNRPDKI/action/citation_signature","submit_replication":"https://pith.science/pith/VJ22GHPEWZ7QP4M5PJSRNRPDKI/action/replication_record"}},"created_at":"2026-05-18T03:05:08.466173+00:00","updated_at":"2026-05-18T03:05:08.466173+00:00"}