{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2014:VUNUBORGB7I2OUSDTNF6YC46VD","short_pith_number":"pith:VUNUBORG","schema_version":"1.0","canonical_sha256":"ad1b40ba260fd1a752439b4bec0b9ea8fbe3bf630816bf53db6c9433e62feccd","source":{"kind":"arxiv","id":"1401.5239","version":1},"attestation_state":"computed","paper":{"title":"Nearly compensated exchange in the dimer compound callaghanite Cu$_2$Mg$_2$(CO$_3$)(OH)$_6$$\\cdot$2H$_2$O","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":"2014-01-21T09:48:15Z","abstract_excerpt":"A combined theoretical and experimental study of the natural Cu(2+)-mineral callaghanite is presented. Its crystal structure features well separated Cu$_2$(OH)$_6$ structural dimers with weakly bonded carbonate groups and water molecules in between. Susceptibility, field-dependent magnetization and specific heat measurements reveal a compound with a small spin gap of about 7 K. The observed magnetic properties are well described by a model of isolated antiferromagnetic spin dimers. Possible ferromagnetic interactions between the dimers amount to -1.5 K, at most. Different flavors of electronic"},"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":"1401.5239","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2014-01-21T09:48:15Z","cross_cats_sorted":[],"title_canon_sha256":"64609ef8529013963a798f9295c1b1e3aa39b3c8a14f7dfa4acfb1badb6f9313","abstract_canon_sha256":"127cdb4cfb6fdee4e8a62b700beddc47a8e52a1b148703eae5b632cd72012c22"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:53:40.030790Z","signature_b64":"SNO2inAm644wbEDqDQ0r7fwEo2ONwisQq/CJat+YbP/a3WzhO9c6BGeCziRTRznNjE3eoLeXhfCKeUPv18yJCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ad1b40ba260fd1a752439b4bec0b9ea8fbe3bf630816bf53db6c9433e62feccd","last_reissued_at":"2026-05-18T02:53:40.030144Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:53:40.030144Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Nearly compensated exchange in the dimer compound callaghanite Cu$_2$Mg$_2$(CO$_3$)(OH)$_6$$\\cdot$2H$_2$O","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.str-el","authors_text":"Alexander A. Tsirlin, Helge Rosner, Oleg Janson, Stefan Lebernegg","submitted_at":"2014-01-21T09:48:15Z","abstract_excerpt":"A combined theoretical and experimental study of the natural Cu(2+)-mineral callaghanite is presented. Its crystal structure features well separated Cu$_2$(OH)$_6$ structural dimers with weakly bonded carbonate groups and water molecules in between. Susceptibility, field-dependent magnetization and specific heat measurements reveal a compound with a small spin gap of about 7 K. The observed magnetic properties are well described by a model of isolated antiferromagnetic spin dimers. Possible ferromagnetic interactions between the dimers amount to -1.5 K, at most. Different flavors of electronic"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1401.5239","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":"1401.5239","created_at":"2026-05-18T02:53:40.030245+00:00"},{"alias_kind":"arxiv_version","alias_value":"1401.5239v1","created_at":"2026-05-18T02:53:40.030245+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1401.5239","created_at":"2026-05-18T02:53:40.030245+00:00"},{"alias_kind":"pith_short_12","alias_value":"VUNUBORGB7I2","created_at":"2026-05-18T12:28:54.890064+00:00"},{"alias_kind":"pith_short_16","alias_value":"VUNUBORGB7I2OUSD","created_at":"2026-05-18T12:28:54.890064+00:00"},{"alias_kind":"pith_short_8","alias_value":"VUNUBORG","created_at":"2026-05-18T12:28:54.890064+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/VUNUBORGB7I2OUSDTNF6YC46VD","json":"https://pith.science/pith/VUNUBORGB7I2OUSDTNF6YC46VD.json","graph_json":"https://pith.science/api/pith-number/VUNUBORGB7I2OUSDTNF6YC46VD/graph.json","events_json":"https://pith.science/api/pith-number/VUNUBORGB7I2OUSDTNF6YC46VD/events.json","paper":"https://pith.science/paper/VUNUBORG"},"agent_actions":{"view_html":"https://pith.science/pith/VUNUBORGB7I2OUSDTNF6YC46VD","download_json":"https://pith.science/pith/VUNUBORGB7I2OUSDTNF6YC46VD.json","view_paper":"https://pith.science/paper/VUNUBORG","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1401.5239&json=true","fetch_graph":"https://pith.science/api/pith-number/VUNUBORGB7I2OUSDTNF6YC46VD/graph.json","fetch_events":"https://pith.science/api/pith-number/VUNUBORGB7I2OUSDTNF6YC46VD/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/VUNUBORGB7I2OUSDTNF6YC46VD/action/timestamp_anchor","attest_storage":"https://pith.science/pith/VUNUBORGB7I2OUSDTNF6YC46VD/action/storage_attestation","attest_author":"https://pith.science/pith/VUNUBORGB7I2OUSDTNF6YC46VD/action/author_attestation","sign_citation":"https://pith.science/pith/VUNUBORGB7I2OUSDTNF6YC46VD/action/citation_signature","submit_replication":"https://pith.science/pith/VUNUBORGB7I2OUSDTNF6YC46VD/action/replication_record"}},"created_at":"2026-05-18T02:53:40.030245+00:00","updated_at":"2026-05-18T02:53:40.030245+00:00"}