{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:L4P63DEFRTX34XOKJHTP5GCIIX","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":"8b129ebf827dddadc1afdfaa0fd2fcc66f55c5383c285083bfd1e1236d2279da","cross_cats_sorted":["cond-mat.mtrl-sci"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2009-05-12T15:58:37Z","title_canon_sha256":"fb4afb7a9d80a975d896e1c29460b93afbd9beb44071c53f39f217f16c58cf98"},"schema_version":"1.0","source":{"id":"0905.1891","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0905.1891","created_at":"2026-05-18T04:39:39Z"},{"alias_kind":"arxiv_version","alias_value":"0905.1891v1","created_at":"2026-05-18T04:39:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0905.1891","created_at":"2026-05-18T04:39:39Z"},{"alias_kind":"pith_short_12","alias_value":"L4P63DEFRTX3","created_at":"2026-05-18T12:26:00Z"},{"alias_kind":"pith_short_16","alias_value":"L4P63DEFRTX34XOK","created_at":"2026-05-18T12:26:00Z"},{"alias_kind":"pith_short_8","alias_value":"L4P63DEF","created_at":"2026-05-18T12:26:00Z"}],"graph_snapshots":[{"event_id":"sha256:e4af697026e209c1fce4133e0755ca0e16b29353d956b1f33d7815387235e226","target":"graph","created_at":"2026-05-18T04:39:39Z","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":"Raman scattering measurements on BiFeO3 single crystals show an important coupling between the magnetic order and lattice vibrations. The temperature evolution of phonons shows that the lowest energy E and A1 phonon modes are coupled to the spin order up to the Neel temperature. Furthermore, low temperature anomalies associated with the spin re-orientation are observed simultaneously in both the E phonon and the magnon. These results suggest that magnetostriction plays an important role in BiFeO3.","authors_text":"A. Sacuto, D. Colson, D. Lebeugle, M. Cazayous, P. Rovillain, R.P.S.M. Lobo, Y. Gallais","cross_cats":["cond-mat.mtrl-sci"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2009-05-12T15:58:37Z","title":"Polar phonons and spin excitations coupling in multiferroic BiFeO3 crystals"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0905.1891","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:de57907c8d0f3a275c332f71dee193b15b6026cdb502ad7261dc868e4244bf81","target":"record","created_at":"2026-05-18T04:39:39Z","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":"8b129ebf827dddadc1afdfaa0fd2fcc66f55c5383c285083bfd1e1236d2279da","cross_cats_sorted":["cond-mat.mtrl-sci"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2009-05-12T15:58:37Z","title_canon_sha256":"fb4afb7a9d80a975d896e1c29460b93afbd9beb44071c53f39f217f16c58cf98"},"schema_version":"1.0","source":{"id":"0905.1891","kind":"arxiv","version":1}},"canonical_sha256":"5f1fed8c858cefbe5dca49e6fe984845d945bfce81385ed45d3fbd487fbf01b0","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5f1fed8c858cefbe5dca49e6fe984845d945bfce81385ed45d3fbd487fbf01b0","first_computed_at":"2026-05-18T04:39:39.287660Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:39:39.287660Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"sOOax+xAjjfOqx8C8k7W40sg5w17h4wU+mJB8xiJvH/Tke8K6naKH2igtvHCKzoBGj1xF24Gyk3ta/2LdFV8DA==","signature_status":"signed_v1","signed_at":"2026-05-18T04:39:39.288185Z","signed_message":"canonical_sha256_bytes"},"source_id":"0905.1891","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:de57907c8d0f3a275c332f71dee193b15b6026cdb502ad7261dc868e4244bf81","sha256:e4af697026e209c1fce4133e0755ca0e16b29353d956b1f33d7815387235e226"],"state_sha256":"bf40b93dbcfa864384295715718d27ea225e94ebd52d5612f70adabb1dd7eda1"}