{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:3CC32H6ZJJVZVPR7AO7QFKKSUB","short_pith_number":"pith:3CC32H6Z","canonical_record":{"source":{"id":"0906.0492","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2009-06-02T14:39:03Z","cross_cats_sorted":[],"title_canon_sha256":"05c57d50684a15501b107d09fafd890f8e98c6bf6f5b19abac754d8fffabe920","abstract_canon_sha256":"65fad0bbc3a8b1b5df7c12de0e5c15cf93699c13abce8c650387611a28f37553"},"schema_version":"1.0"},"canonical_sha256":"d885bd1fd94a6b9abe3f03bf02a952a050e080c39cb1d7d4301caab4baa9bb53","source":{"kind":"arxiv","id":"0906.0492","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0906.0492","created_at":"2026-05-18T02:13:29Z"},{"alias_kind":"arxiv_version","alias_value":"0906.0492v1","created_at":"2026-05-18T02:13:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0906.0492","created_at":"2026-05-18T02:13:29Z"},{"alias_kind":"pith_short_12","alias_value":"3CC32H6ZJJVZ","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"3CC32H6ZJJVZVPR7","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"3CC32H6Z","created_at":"2026-05-18T12:25:58Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:3CC32H6ZJJVZVPR7AO7QFKKSUB","target":"record","payload":{"canonical_record":{"source":{"id":"0906.0492","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2009-06-02T14:39:03Z","cross_cats_sorted":[],"title_canon_sha256":"05c57d50684a15501b107d09fafd890f8e98c6bf6f5b19abac754d8fffabe920","abstract_canon_sha256":"65fad0bbc3a8b1b5df7c12de0e5c15cf93699c13abce8c650387611a28f37553"},"schema_version":"1.0"},"canonical_sha256":"d885bd1fd94a6b9abe3f03bf02a952a050e080c39cb1d7d4301caab4baa9bb53","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:13:29.730436Z","signature_b64":"6ZPfaaBTIGKZbRKCxIf9HMZvEPQTrzQ5umI81yJ/jGQARmViumPrbLK2OFIFJQUlk7wsFKowO4+dQ1Av4lEKAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d885bd1fd94a6b9abe3f03bf02a952a050e080c39cb1d7d4301caab4baa9bb53","last_reissued_at":"2026-05-18T02:13:29.729855Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:13:29.729855Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0906.0492","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:13:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lw+FzCl4/QdtEYjt5E1GJd33JP7drxfp3zn66ZdlWbJaTwaVNoue82TGP4Wp1LHqBSmjtGzCtrISQKglefc9CQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T06:14:51.676040Z"},"content_sha256":"e89f96c4a9fde98a84683aa4be44ddafed9a1ee97c37b4dd633b514b0a95add0","schema_version":"1.0","event_id":"sha256:e89f96c4a9fde98a84683aa4be44ddafed9a1ee97c37b4dd633b514b0a95add0"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:3CC32H6ZJJVZVPR7AO7QFKKSUB","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Ferroelectricity in multiferroic magnetite Fe3O4 driven by noncentrosymmetric Fe2+/Fe3+ charge-ordering: First-principles study","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Kunihiko Yamauchi, Silvia Picozzi, Tetsuya Fukushima","submitted_at":"2009-06-02T14:39:03Z","abstract_excerpt":"By means of first-principles simulations, we unambiguously show that improper ferroelectricity in magnetite in the low-temperature insulating phase is driven by charge-ordering. An accurate comparison between monoclinic ferroelectric Cc and paraelectric P2/c structures shows that the polarization arises because of \"shifts\" of electronic charge between octahedral Fe sites, leading to a non-centrosymmetric Fe2+/Fe3+ charge-ordered pattern. Our predicted values for polarization, in good agreement with available experimental values, are discussed in terms of point-charge dipoles located on selecte"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0906.0492","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:13:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bVjMnI0EQvvJrqHUytoXem2QGAFVwXfr9DrDfyHyxzMpwrf0dZgS+T3Z8aN+1AncC/A4bsl65BfZtXVkI2gVAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T06:14:51.676625Z"},"content_sha256":"4dc10ad7b49f2247adc6107e0a593f86fe2c106095652f31069e3e479d7802ea","schema_version":"1.0","event_id":"sha256:4dc10ad7b49f2247adc6107e0a593f86fe2c106095652f31069e3e479d7802ea"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/3CC32H6ZJJVZVPR7AO7QFKKSUB/bundle.json","state_url":"https://pith.science/pith/3CC32H6ZJJVZVPR7AO7QFKKSUB/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/3CC32H6ZJJVZVPR7AO7QFKKSUB/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-05-27T06:14:51Z","links":{"resolver":"https://pith.science/pith/3CC32H6ZJJVZVPR7AO7QFKKSUB","bundle":"https://pith.science/pith/3CC32H6ZJJVZVPR7AO7QFKKSUB/bundle.json","state":"https://pith.science/pith/3CC32H6ZJJVZVPR7AO7QFKKSUB/state.json","well_known_bundle":"https://pith.science/.well-known/pith/3CC32H6ZJJVZVPR7AO7QFKKSUB/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:3CC32H6ZJJVZVPR7AO7QFKKSUB","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":"65fad0bbc3a8b1b5df7c12de0e5c15cf93699c13abce8c650387611a28f37553","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2009-06-02T14:39:03Z","title_canon_sha256":"05c57d50684a15501b107d09fafd890f8e98c6bf6f5b19abac754d8fffabe920"},"schema_version":"1.0","source":{"id":"0906.0492","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0906.0492","created_at":"2026-05-18T02:13:29Z"},{"alias_kind":"arxiv_version","alias_value":"0906.0492v1","created_at":"2026-05-18T02:13:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0906.0492","created_at":"2026-05-18T02:13:29Z"},{"alias_kind":"pith_short_12","alias_value":"3CC32H6ZJJVZ","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"3CC32H6ZJJVZVPR7","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"3CC32H6Z","created_at":"2026-05-18T12:25:58Z"}],"graph_snapshots":[{"event_id":"sha256:4dc10ad7b49f2247adc6107e0a593f86fe2c106095652f31069e3e479d7802ea","target":"graph","created_at":"2026-05-18T02:13:29Z","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":"By means of first-principles simulations, we unambiguously show that improper ferroelectricity in magnetite in the low-temperature insulating phase is driven by charge-ordering. An accurate comparison between monoclinic ferroelectric Cc and paraelectric P2/c structures shows that the polarization arises because of \"shifts\" of electronic charge between octahedral Fe sites, leading to a non-centrosymmetric Fe2+/Fe3+ charge-ordered pattern. Our predicted values for polarization, in good agreement with available experimental values, are discussed in terms of point-charge dipoles located on selecte","authors_text":"Kunihiko Yamauchi, Silvia Picozzi, Tetsuya Fukushima","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2009-06-02T14:39:03Z","title":"Ferroelectricity in multiferroic magnetite Fe3O4 driven by noncentrosymmetric Fe2+/Fe3+ charge-ordering: First-principles study"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0906.0492","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:e89f96c4a9fde98a84683aa4be44ddafed9a1ee97c37b4dd633b514b0a95add0","target":"record","created_at":"2026-05-18T02:13:29Z","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":"65fad0bbc3a8b1b5df7c12de0e5c15cf93699c13abce8c650387611a28f37553","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2009-06-02T14:39:03Z","title_canon_sha256":"05c57d50684a15501b107d09fafd890f8e98c6bf6f5b19abac754d8fffabe920"},"schema_version":"1.0","source":{"id":"0906.0492","kind":"arxiv","version":1}},"canonical_sha256":"d885bd1fd94a6b9abe3f03bf02a952a050e080c39cb1d7d4301caab4baa9bb53","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d885bd1fd94a6b9abe3f03bf02a952a050e080c39cb1d7d4301caab4baa9bb53","first_computed_at":"2026-05-18T02:13:29.729855Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:13:29.729855Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"6ZPfaaBTIGKZbRKCxIf9HMZvEPQTrzQ5umI81yJ/jGQARmViumPrbLK2OFIFJQUlk7wsFKowO4+dQ1Av4lEKAg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:13:29.730436Z","signed_message":"canonical_sha256_bytes"},"source_id":"0906.0492","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e89f96c4a9fde98a84683aa4be44ddafed9a1ee97c37b4dd633b514b0a95add0","sha256:4dc10ad7b49f2247adc6107e0a593f86fe2c106095652f31069e3e479d7802ea"],"state_sha256":"d5f39dc9ea9dc1d197a5afcffcdae2364efecadcc895aac1de3364df31fbaea5"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6berddyBzYAciL4IY9DQZd6bUEQSDSHcn/Q8CHU3Y7wQRFQ5lTx5O8kq80v1Mi+XpqddQb5DwSpuZIccQEYoCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T06:14:51.680193Z","bundle_sha256":"005e2a123f175d04238324e831463683b6dc287c84a0a6ea9f4b8abd95919cf5"}}