{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:F2XRJP4WFRJWIBLH6YD5SWIPIF","short_pith_number":"pith:F2XRJP4W","canonical_record":{"source":{"id":"1307.1519","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2013-07-05T04:40:33Z","cross_cats_sorted":["cond-mat.mtrl-sci"],"title_canon_sha256":"13da01863887ce883e93f1d3be77d7e1b7b250d03addd44489a075f859dc4d70","abstract_canon_sha256":"91a9672056c00cb0270f7cac5ea5f323ef258625e09baec2f317c3152befb697"},"schema_version":"1.0"},"canonical_sha256":"2eaf14bf962c53640567f607d9590f41667cf1502e548369b970748d75e2282f","source":{"kind":"arxiv","id":"1307.1519","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1307.1519","created_at":"2026-05-18T03:13:45Z"},{"alias_kind":"arxiv_version","alias_value":"1307.1519v2","created_at":"2026-05-18T03:13:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1307.1519","created_at":"2026-05-18T03:13:45Z"},{"alias_kind":"pith_short_12","alias_value":"F2XRJP4WFRJW","created_at":"2026-05-18T12:27:43Z"},{"alias_kind":"pith_short_16","alias_value":"F2XRJP4WFRJWIBLH","created_at":"2026-05-18T12:27:43Z"},{"alias_kind":"pith_short_8","alias_value":"F2XRJP4W","created_at":"2026-05-18T12:27:43Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:F2XRJP4WFRJWIBLH6YD5SWIPIF","target":"record","payload":{"canonical_record":{"source":{"id":"1307.1519","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2013-07-05T04:40:33Z","cross_cats_sorted":["cond-mat.mtrl-sci"],"title_canon_sha256":"13da01863887ce883e93f1d3be77d7e1b7b250d03addd44489a075f859dc4d70","abstract_canon_sha256":"91a9672056c00cb0270f7cac5ea5f323ef258625e09baec2f317c3152befb697"},"schema_version":"1.0"},"canonical_sha256":"2eaf14bf962c53640567f607d9590f41667cf1502e548369b970748d75e2282f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:13:45.407388Z","signature_b64":"/h7/1a3oodv1rDz+Wyr7Q/Xd3HIbLMqGnGOVt+ZIcpbWIVNR8X26Dklt7z7fyA/GBfnILAoiaKTXg58wVSC7BA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2eaf14bf962c53640567f607d9590f41667cf1502e548369b970748d75e2282f","last_reissued_at":"2026-05-18T03:13:45.406669Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:13:45.406669Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1307.1519","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T03:13:45Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Jcol/7VBSEXoeQe0LNqgBbMW+w6vo3UMPvhLRZ6oStySzfbhmSL3NqTsvSLQ1wFkQCZObkwlu3fFSue1tvlCDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T13:58:17.681771Z"},"content_sha256":"a43a80fa69a180292f649227ba9639aba5a64a78d6d3973455200b8a0448df95","schema_version":"1.0","event_id":"sha256:a43a80fa69a180292f649227ba9639aba5a64a78d6d3973455200b8a0448df95"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:F2XRJP4WFRJWIBLH6YD5SWIPIF","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Negative magnetostrictive magnetoelectric coupling of BiFeO3","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.mtrl-sci"],"primary_cat":"cond-mat.str-el","authors_text":"D. T. Adroja, H. Kimura, Je-Geun Park, Junghwan Park, M. Mostovoy, M. T. Fernandez-Diaz, Sanghyun Lee, Seongsu Lee, S-W. Cheong, V. Kiryukhin, Y. Noda","submitted_at":"2013-07-05T04:40:33Z","abstract_excerpt":"How the magnetoelectric coupling actually occurs on a microscopic level in multiferroic BiFeO3 is not well known. By using the high-resolution single crystal neutron diffraction techniques, we have determined the electric polarization of each individual elements of BiFeO3, and concluded that the magnetostrictive coupling suppresses the electric polarization at the Fe site below TN. This negative magnetoelectric coupling appears to outweigh the spin current contributions arising from the cycloid spin structure, which should produce a positive magnetoelectric coupling."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1307.1519","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T03:13:45Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dR7fvD1XBAxOwuJJoSYOj5TLQLedTBblvpBUQqsqbUTBCxkDL87+FBO35hEd0eTvKmlQWgokVwcEViQL56FrAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T13:58:17.682450Z"},"content_sha256":"064b04413e077487d2ce9d7293495f374c6f2d16e10c71119867d39cc6922248","schema_version":"1.0","event_id":"sha256:064b04413e077487d2ce9d7293495f374c6f2d16e10c71119867d39cc6922248"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/F2XRJP4WFRJWIBLH6YD5SWIPIF/bundle.json","state_url":"https://pith.science/pith/F2XRJP4WFRJWIBLH6YD5SWIPIF/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/F2XRJP4WFRJWIBLH6YD5SWIPIF/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":"2026-05-25T13:58:17Z","links":{"resolver":"https://pith.science/pith/F2XRJP4WFRJWIBLH6YD5SWIPIF","bundle":"https://pith.science/pith/F2XRJP4WFRJWIBLH6YD5SWIPIF/bundle.json","state":"https://pith.science/pith/F2XRJP4WFRJWIBLH6YD5SWIPIF/state.json","well_known_bundle":"https://pith.science/.well-known/pith/F2XRJP4WFRJWIBLH6YD5SWIPIF/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:F2XRJP4WFRJWIBLH6YD5SWIPIF","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":"91a9672056c00cb0270f7cac5ea5f323ef258625e09baec2f317c3152befb697","cross_cats_sorted":["cond-mat.mtrl-sci"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2013-07-05T04:40:33Z","title_canon_sha256":"13da01863887ce883e93f1d3be77d7e1b7b250d03addd44489a075f859dc4d70"},"schema_version":"1.0","source":{"id":"1307.1519","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1307.1519","created_at":"2026-05-18T03:13:45Z"},{"alias_kind":"arxiv_version","alias_value":"1307.1519v2","created_at":"2026-05-18T03:13:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1307.1519","created_at":"2026-05-18T03:13:45Z"},{"alias_kind":"pith_short_12","alias_value":"F2XRJP4WFRJW","created_at":"2026-05-18T12:27:43Z"},{"alias_kind":"pith_short_16","alias_value":"F2XRJP4WFRJWIBLH","created_at":"2026-05-18T12:27:43Z"},{"alias_kind":"pith_short_8","alias_value":"F2XRJP4W","created_at":"2026-05-18T12:27:43Z"}],"graph_snapshots":[{"event_id":"sha256:064b04413e077487d2ce9d7293495f374c6f2d16e10c71119867d39cc6922248","target":"graph","created_at":"2026-05-18T03:13:45Z","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":"How the magnetoelectric coupling actually occurs on a microscopic level in multiferroic BiFeO3 is not well known. By using the high-resolution single crystal neutron diffraction techniques, we have determined the electric polarization of each individual elements of BiFeO3, and concluded that the magnetostrictive coupling suppresses the electric polarization at the Fe site below TN. This negative magnetoelectric coupling appears to outweigh the spin current contributions arising from the cycloid spin structure, which should produce a positive magnetoelectric coupling.","authors_text":"D. T. Adroja, H. Kimura, Je-Geun Park, Junghwan Park, M. Mostovoy, M. T. Fernandez-Diaz, Sanghyun Lee, Seongsu Lee, S-W. Cheong, V. Kiryukhin, Y. Noda","cross_cats":["cond-mat.mtrl-sci"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2013-07-05T04:40:33Z","title":"Negative magnetostrictive magnetoelectric coupling of BiFeO3"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1307.1519","kind":"arxiv","version":2},"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:a43a80fa69a180292f649227ba9639aba5a64a78d6d3973455200b8a0448df95","target":"record","created_at":"2026-05-18T03:13:45Z","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":"91a9672056c00cb0270f7cac5ea5f323ef258625e09baec2f317c3152befb697","cross_cats_sorted":["cond-mat.mtrl-sci"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2013-07-05T04:40:33Z","title_canon_sha256":"13da01863887ce883e93f1d3be77d7e1b7b250d03addd44489a075f859dc4d70"},"schema_version":"1.0","source":{"id":"1307.1519","kind":"arxiv","version":2}},"canonical_sha256":"2eaf14bf962c53640567f607d9590f41667cf1502e548369b970748d75e2282f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2eaf14bf962c53640567f607d9590f41667cf1502e548369b970748d75e2282f","first_computed_at":"2026-05-18T03:13:45.406669Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:13:45.406669Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"/h7/1a3oodv1rDz+Wyr7Q/Xd3HIbLMqGnGOVt+ZIcpbWIVNR8X26Dklt7z7fyA/GBfnILAoiaKTXg58wVSC7BA==","signature_status":"signed_v1","signed_at":"2026-05-18T03:13:45.407388Z","signed_message":"canonical_sha256_bytes"},"source_id":"1307.1519","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a43a80fa69a180292f649227ba9639aba5a64a78d6d3973455200b8a0448df95","sha256:064b04413e077487d2ce9d7293495f374c6f2d16e10c71119867d39cc6922248"],"state_sha256":"0f29adf1f237a98ad938fd6aa712507d1f90706a0ce4b822e20821604107fc98"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Dwe9T4+A039J0DxwMQitsNnP06zotI0ZAF+NxE2UMk2ZgDtv3k2eO33n8Aric/aD9xBJIqkWVElc9tob59p5Bg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T13:58:17.685712Z","bundle_sha256":"20174369788cb56393321209489719ee32558323416bc8007a49a6c0e5d874ad"}}