{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:HX6FOI4V3WTEAPCFIFYHVHLGGL","short_pith_number":"pith:HX6FOI4V","canonical_record":{"source":{"id":"1103.3151","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2011-03-16T11:58:44Z","cross_cats_sorted":[],"title_canon_sha256":"5d51cb107dd568679c9719753a963a585d961c73360179c6cee4d50d050080c9","abstract_canon_sha256":"a4e12528bdedb3a26bf67bc34a910b39b0f6ff859eb0a232a5226210c0b60abd"},"schema_version":"1.0"},"canonical_sha256":"3dfc572395dda6403c4541707a9d6632c59eab005657ae4288722483a405f940","source":{"kind":"arxiv","id":"1103.3151","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1103.3151","created_at":"2026-05-18T02:02:50Z"},{"alias_kind":"arxiv_version","alias_value":"1103.3151v1","created_at":"2026-05-18T02:02:50Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1103.3151","created_at":"2026-05-18T02:02:50Z"},{"alias_kind":"pith_short_12","alias_value":"HX6FOI4V3WTE","created_at":"2026-05-18T12:26:30Z"},{"alias_kind":"pith_short_16","alias_value":"HX6FOI4V3WTEAPCF","created_at":"2026-05-18T12:26:30Z"},{"alias_kind":"pith_short_8","alias_value":"HX6FOI4V","created_at":"2026-05-18T12:26:30Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:HX6FOI4V3WTEAPCFIFYHVHLGGL","target":"record","payload":{"canonical_record":{"source":{"id":"1103.3151","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2011-03-16T11:58:44Z","cross_cats_sorted":[],"title_canon_sha256":"5d51cb107dd568679c9719753a963a585d961c73360179c6cee4d50d050080c9","abstract_canon_sha256":"a4e12528bdedb3a26bf67bc34a910b39b0f6ff859eb0a232a5226210c0b60abd"},"schema_version":"1.0"},"canonical_sha256":"3dfc572395dda6403c4541707a9d6632c59eab005657ae4288722483a405f940","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:02:50.914240Z","signature_b64":"A6fOAcZq36GNwBT0vTn4/6T3RuMqKbYq/Uxb8Jo3JhhKQl3/mBmlvjlkmw3kNdN9e63Bfa0WukAT4jJF1y5FAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3dfc572395dda6403c4541707a9d6632c59eab005657ae4288722483a405f940","last_reissued_at":"2026-05-18T02:02:50.913618Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:02:50.913618Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1103.3151","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":"2026-05-18T02:02:50Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"XCrLBoP9E5MWlf6mssmLTumaDv6jLuna0oNPakm5ymY1N7QOe/t/GP4Kd/urXCSvfqHi9M+C9JXUEM8/7AudCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T12:56:15.474872Z"},"content_sha256":"9ebd09b7b2ff34d0a6df55e8c7120fdc11b6abd4d8d0d68a7f3895027abda050","schema_version":"1.0","event_id":"sha256:9ebd09b7b2ff34d0a6df55e8c7120fdc11b6abd4d8d0d68a7f3895027abda050"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:HX6FOI4V3WTEAPCFIFYHVHLGGL","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Theoretical investigation of magnetoelectric effects in Ba2CoGe2O7","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.str-el","authors_text":"Kunihiko Yamauchi, Paolo Barone, Silvia Picozzi","submitted_at":"2011-03-16T11:58:44Z","abstract_excerpt":"A joint theoretical approach, combining macroscopic symmetry analysis with microscopic methods (density functional theory and model cluster Hamiltonian), is employed to shed light on magnetoelectricity in Ba2CoGe2O7. We show that the recently reported experimental trend of polarization guided by magnetic field can be predicted on the basis of phenomenological Landau theory. From the microscopic side, Ba2CoGe2O7 emerges as a prototype of a class of magnetoelectrics, where the cross coupling between magnetic and dipolar degrees of freedom needs, as main ingredients, the on-site spin-orbit coupli"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1103.3151","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":"2026-05-18T02:02:50Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ckxkAXMWOk4jZ/o/la+UN3nEp64sTwEiFYFcVnWUSQaI5dt9154T9Sd2t2c+BNhb+yKqI1h5YJcBtfNRcQBZDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T12:56:15.475307Z"},"content_sha256":"b5ae89f057cadf11b33e733862933e5ce0d2c5286bcc5ef0e0f33e1406d70656","schema_version":"1.0","event_id":"sha256:b5ae89f057cadf11b33e733862933e5ce0d2c5286bcc5ef0e0f33e1406d70656"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/HX6FOI4V3WTEAPCFIFYHVHLGGL/bundle.json","state_url":"https://pith.science/pith/HX6FOI4V3WTEAPCFIFYHVHLGGL/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/HX6FOI4V3WTEAPCFIFYHVHLGGL/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":"2026-05-27T12:56:15Z","links":{"resolver":"https://pith.science/pith/HX6FOI4V3WTEAPCFIFYHVHLGGL","bundle":"https://pith.science/pith/HX6FOI4V3WTEAPCFIFYHVHLGGL/bundle.json","state":"https://pith.science/pith/HX6FOI4V3WTEAPCFIFYHVHLGGL/state.json","well_known_bundle":"https://pith.science/.well-known/pith/HX6FOI4V3WTEAPCFIFYHVHLGGL/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:HX6FOI4V3WTEAPCFIFYHVHLGGL","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":"a4e12528bdedb3a26bf67bc34a910b39b0f6ff859eb0a232a5226210c0b60abd","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2011-03-16T11:58:44Z","title_canon_sha256":"5d51cb107dd568679c9719753a963a585d961c73360179c6cee4d50d050080c9"},"schema_version":"1.0","source":{"id":"1103.3151","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1103.3151","created_at":"2026-05-18T02:02:50Z"},{"alias_kind":"arxiv_version","alias_value":"1103.3151v1","created_at":"2026-05-18T02:02:50Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1103.3151","created_at":"2026-05-18T02:02:50Z"},{"alias_kind":"pith_short_12","alias_value":"HX6FOI4V3WTE","created_at":"2026-05-18T12:26:30Z"},{"alias_kind":"pith_short_16","alias_value":"HX6FOI4V3WTEAPCF","created_at":"2026-05-18T12:26:30Z"},{"alias_kind":"pith_short_8","alias_value":"HX6FOI4V","created_at":"2026-05-18T12:26:30Z"}],"graph_snapshots":[{"event_id":"sha256:b5ae89f057cadf11b33e733862933e5ce0d2c5286bcc5ef0e0f33e1406d70656","target":"graph","created_at":"2026-05-18T02:02:50Z","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":"A joint theoretical approach, combining macroscopic symmetry analysis with microscopic methods (density functional theory and model cluster Hamiltonian), is employed to shed light on magnetoelectricity in Ba2CoGe2O7. We show that the recently reported experimental trend of polarization guided by magnetic field can be predicted on the basis of phenomenological Landau theory. From the microscopic side, Ba2CoGe2O7 emerges as a prototype of a class of magnetoelectrics, where the cross coupling between magnetic and dipolar degrees of freedom needs, as main ingredients, the on-site spin-orbit coupli","authors_text":"Kunihiko Yamauchi, Paolo Barone, Silvia Picozzi","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2011-03-16T11:58:44Z","title":"Theoretical investigation of magnetoelectric effects in Ba2CoGe2O7"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1103.3151","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":"sha256:9ebd09b7b2ff34d0a6df55e8c7120fdc11b6abd4d8d0d68a7f3895027abda050","target":"record","created_at":"2026-05-18T02:02:50Z","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":"a4e12528bdedb3a26bf67bc34a910b39b0f6ff859eb0a232a5226210c0b60abd","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2011-03-16T11:58:44Z","title_canon_sha256":"5d51cb107dd568679c9719753a963a585d961c73360179c6cee4d50d050080c9"},"schema_version":"1.0","source":{"id":"1103.3151","kind":"arxiv","version":1}},"canonical_sha256":"3dfc572395dda6403c4541707a9d6632c59eab005657ae4288722483a405f940","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3dfc572395dda6403c4541707a9d6632c59eab005657ae4288722483a405f940","first_computed_at":"2026-05-18T02:02:50.913618Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:02:50.913618Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"A6fOAcZq36GNwBT0vTn4/6T3RuMqKbYq/Uxb8Jo3JhhKQl3/mBmlvjlkmw3kNdN9e63Bfa0WukAT4jJF1y5FAg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:02:50.914240Z","signed_message":"canonical_sha256_bytes"},"source_id":"1103.3151","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9ebd09b7b2ff34d0a6df55e8c7120fdc11b6abd4d8d0d68a7f3895027abda050","sha256:b5ae89f057cadf11b33e733862933e5ce0d2c5286bcc5ef0e0f33e1406d70656"],"state_sha256":"011613921ed893f0edbcdddfcde59e881dbe926c3100b9da5e23a76f4532a52c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3LQr9iRtrBZjuNgPPP3UuyntG0dNQ6L6i8Ky9VOZXsnclmuSYMC7CUCsdOTMUtpeV5kAO6fsy2R6xWQVHRzQDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T12:56:15.479157Z","bundle_sha256":"13ee7cf57e123304880f56469a85f64b9f589ef61ce5a5b9c43ed783d6baeb80"}}