{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2011:UW7TKKNBXCDO2EO2FXDQURMUQC","short_pith_number":"pith:UW7TKKNB","schema_version":"1.0","canonical_sha256":"a5bf3529a1b886ed11da2dc70a459480b386a0b5f7bda30ec71009a4617c67e0","source":{"kind":"arxiv","id":"1101.3819","version":2},"attestation_state":"computed","paper":{"title":"Spin-state crossover and hyperfine interactions of ferric iron in MgSiO$_3$ perovskite","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.mtrl-sci"],"primary_cat":"physics.geo-ph","authors_text":"Han Hsu, Matteo Cococcioni, Peter Blaha, Renata M. Wentzcovitch","submitted_at":"2011-01-20T04:51:23Z","abstract_excerpt":"Using density functional theory plus Hubbard $U$ calculations, we show that the ground state of (Mg,Fe)(Si,Fe)O$_3$ perovskite, a major mineral phase in the Earth's lower mantle, has high-spin ferric iron ($S=5/2$) at both the dodecahedral (A) and octahedral (B) site. As the pressure increases, the B-site iron undergoes a spin-state crossover to the low-spin state ($S=1/2$), while the A-site iron remains in the high-spin state. Our calculation shows that the B-site spin-state crossover in the pressure range of 40-70 GPa is accompanied by a noticeable volume reduction and an increase in quadrup"},"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":"1101.3819","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.geo-ph","submitted_at":"2011-01-20T04:51:23Z","cross_cats_sorted":["cond-mat.mtrl-sci"],"title_canon_sha256":"0fb417d3353b596af312cb3141fa5858ad577dc68be868f2a48732ac59d3f0e7","abstract_canon_sha256":"80756703880e88d6dc76ff0f29f4652e51c17869304c9ea42f6609e62c1e4ca1"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:03:26.146024Z","signature_b64":"+OVhoMdIEADcXLsNZc8+YxfD9vWcrPlEN5yXvxXis3txyZvzrlHEvgy4dDt9GrSL+NORTX3XgMRSqILYUeTjBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a5bf3529a1b886ed11da2dc70a459480b386a0b5f7bda30ec71009a4617c67e0","last_reissued_at":"2026-05-18T02:03:26.145242Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:03:26.145242Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Spin-state crossover and hyperfine interactions of ferric iron in MgSiO$_3$ perovskite","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.mtrl-sci"],"primary_cat":"physics.geo-ph","authors_text":"Han Hsu, Matteo Cococcioni, Peter Blaha, Renata M. Wentzcovitch","submitted_at":"2011-01-20T04:51:23Z","abstract_excerpt":"Using density functional theory plus Hubbard $U$ calculations, we show that the ground state of (Mg,Fe)(Si,Fe)O$_3$ perovskite, a major mineral phase in the Earth's lower mantle, has high-spin ferric iron ($S=5/2$) at both the dodecahedral (A) and octahedral (B) site. As the pressure increases, the B-site iron undergoes a spin-state crossover to the low-spin state ($S=1/2$), while the A-site iron remains in the high-spin state. Our calculation shows that the B-site spin-state crossover in the pressure range of 40-70 GPa is accompanied by a noticeable volume reduction and an increase in quadrup"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1101.3819","kind":"arxiv","version":2},"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":"1101.3819","created_at":"2026-05-18T02:03:26.145371+00:00"},{"alias_kind":"arxiv_version","alias_value":"1101.3819v2","created_at":"2026-05-18T02:03:26.145371+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1101.3819","created_at":"2026-05-18T02:03:26.145371+00:00"},{"alias_kind":"pith_short_12","alias_value":"UW7TKKNBXCDO","created_at":"2026-05-18T12:26:42.757692+00:00"},{"alias_kind":"pith_short_16","alias_value":"UW7TKKNBXCDO2EO2","created_at":"2026-05-18T12:26:42.757692+00:00"},{"alias_kind":"pith_short_8","alias_value":"UW7TKKNB","created_at":"2026-05-18T12:26:42.757692+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/UW7TKKNBXCDO2EO2FXDQURMUQC","json":"https://pith.science/pith/UW7TKKNBXCDO2EO2FXDQURMUQC.json","graph_json":"https://pith.science/api/pith-number/UW7TKKNBXCDO2EO2FXDQURMUQC/graph.json","events_json":"https://pith.science/api/pith-number/UW7TKKNBXCDO2EO2FXDQURMUQC/events.json","paper":"https://pith.science/paper/UW7TKKNB"},"agent_actions":{"view_html":"https://pith.science/pith/UW7TKKNBXCDO2EO2FXDQURMUQC","download_json":"https://pith.science/pith/UW7TKKNBXCDO2EO2FXDQURMUQC.json","view_paper":"https://pith.science/paper/UW7TKKNB","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1101.3819&json=true","fetch_graph":"https://pith.science/api/pith-number/UW7TKKNBXCDO2EO2FXDQURMUQC/graph.json","fetch_events":"https://pith.science/api/pith-number/UW7TKKNBXCDO2EO2FXDQURMUQC/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/UW7TKKNBXCDO2EO2FXDQURMUQC/action/timestamp_anchor","attest_storage":"https://pith.science/pith/UW7TKKNBXCDO2EO2FXDQURMUQC/action/storage_attestation","attest_author":"https://pith.science/pith/UW7TKKNBXCDO2EO2FXDQURMUQC/action/author_attestation","sign_citation":"https://pith.science/pith/UW7TKKNBXCDO2EO2FXDQURMUQC/action/citation_signature","submit_replication":"https://pith.science/pith/UW7TKKNBXCDO2EO2FXDQURMUQC/action/replication_record"}},"created_at":"2026-05-18T02:03:26.145371+00:00","updated_at":"2026-05-18T02:03:26.145371+00:00"}