{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:GSXTXSFUTZOJQPUSI7Y5OZRXPI","short_pith_number":"pith:GSXTXSFU","canonical_record":{"source":{"id":"1606.06394","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2016-06-21T01:48:53Z","cross_cats_sorted":["cond-mat.str-el"],"title_canon_sha256":"63ece944453d64e2b465772f4cc19d6ec63c161a839658fad3437a4583cb51fa","abstract_canon_sha256":"3055afd68b89f9d76c96363cc4be92693e903fb0e2b89d8508db06223ce11ce2"},"schema_version":"1.0"},"canonical_sha256":"34af3bc8b49e5c983e9247f1d766377a2d99d6d9fd7045cfebfb0fc52c400da6","source":{"kind":"arxiv","id":"1606.06394","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1606.06394","created_at":"2026-05-18T01:04:05Z"},{"alias_kind":"arxiv_version","alias_value":"1606.06394v1","created_at":"2026-05-18T01:04:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1606.06394","created_at":"2026-05-18T01:04:05Z"},{"alias_kind":"pith_short_12","alias_value":"GSXTXSFUTZOJ","created_at":"2026-05-18T12:30:19Z"},{"alias_kind":"pith_short_16","alias_value":"GSXTXSFUTZOJQPUS","created_at":"2026-05-18T12:30:19Z"},{"alias_kind":"pith_short_8","alias_value":"GSXTXSFU","created_at":"2026-05-18T12:30:19Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:GSXTXSFUTZOJQPUSI7Y5OZRXPI","target":"record","payload":{"canonical_record":{"source":{"id":"1606.06394","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2016-06-21T01:48:53Z","cross_cats_sorted":["cond-mat.str-el"],"title_canon_sha256":"63ece944453d64e2b465772f4cc19d6ec63c161a839658fad3437a4583cb51fa","abstract_canon_sha256":"3055afd68b89f9d76c96363cc4be92693e903fb0e2b89d8508db06223ce11ce2"},"schema_version":"1.0"},"canonical_sha256":"34af3bc8b49e5c983e9247f1d766377a2d99d6d9fd7045cfebfb0fc52c400da6","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:04:05.449038Z","signature_b64":"c+NK2LD1rt+Te1JHel+aVyoH/HfV7cCiGO2ja9O1dYD6lAjU4ts8ALsoAQFWziZyqw//1UjhMtCd/2y4acM2DQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"34af3bc8b49e5c983e9247f1d766377a2d99d6d9fd7045cfebfb0fc52c400da6","last_reissued_at":"2026-05-18T01:04:05.448554Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:04:05.448554Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1606.06394","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":"2026-05-18T01:04:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2jOfhvb+mieMk1fKGK7bzfx/7gHZJTwyP5CI6ny3G8EAKk0NaKg88773w2jjVh+U5ofJTCug33Otxd+rC+wQDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T22:15:37.987648Z"},"content_sha256":"d0847d26bba6c32031fb48c49bddcb7c17810e5cbc9bdce05296530297711afc","schema_version":"1.0","event_id":"sha256:d0847d26bba6c32031fb48c49bddcb7c17810e5cbc9bdce05296530297711afc"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:GSXTXSFUTZOJQPUSI7Y5OZRXPI","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Experimental and first-principles studies of magnetism and magnetoelectric effect in Co4Nb2O9 and Co4Ta2O9","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.str-el"],"primary_cat":"cond-mat.mtrl-sci","authors_text":"I. V. Solovyev, T. V. Kolodiazhnyi","submitted_at":"2016-06-21T01:48:53Z","abstract_excerpt":"We report results of joint experimental and theoretical studies on magnetoelectric (ME) compounds Co4Nb2O9 and Co4Ta2O9. On the experimental side, we present results of the magnetization and dielectric permittivity measurements in the magnetic field. On the theoretical side, we construct the low-energy Hubbard-type model for the magnetically active Co 3d bands in the Wannier basis, using the input of first-principles electronic structure calculations, solve this model in the mean-field Hartree-Fock approximation, and evaluate the electric polarization in terms of the Berry phase theory. Both e"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1606.06394","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":"2026-05-18T01:04:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+2JBWV5IUewjrd5gWXtq3wF0tJUOBeEQOgrIv64DEyANrakstjqsM06S0a6HCeKuurDu96gxdUeJZdErLtdnCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T22:15:37.988351Z"},"content_sha256":"538ce2aebe0acafddde40f03b3efd43497b81d896cef7731a1d21b3fc912ed74","schema_version":"1.0","event_id":"sha256:538ce2aebe0acafddde40f03b3efd43497b81d896cef7731a1d21b3fc912ed74"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/GSXTXSFUTZOJQPUSI7Y5OZRXPI/bundle.json","state_url":"https://pith.science/pith/GSXTXSFUTZOJQPUSI7Y5OZRXPI/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/GSXTXSFUTZOJQPUSI7Y5OZRXPI/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":"2026-05-31T22:15:37Z","links":{"resolver":"https://pith.science/pith/GSXTXSFUTZOJQPUSI7Y5OZRXPI","bundle":"https://pith.science/pith/GSXTXSFUTZOJQPUSI7Y5OZRXPI/bundle.json","state":"https://pith.science/pith/GSXTXSFUTZOJQPUSI7Y5OZRXPI/state.json","well_known_bundle":"https://pith.science/.well-known/pith/GSXTXSFUTZOJQPUSI7Y5OZRXPI/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:GSXTXSFUTZOJQPUSI7Y5OZRXPI","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":"3055afd68b89f9d76c96363cc4be92693e903fb0e2b89d8508db06223ce11ce2","cross_cats_sorted":["cond-mat.str-el"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2016-06-21T01:48:53Z","title_canon_sha256":"63ece944453d64e2b465772f4cc19d6ec63c161a839658fad3437a4583cb51fa"},"schema_version":"1.0","source":{"id":"1606.06394","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1606.06394","created_at":"2026-05-18T01:04:05Z"},{"alias_kind":"arxiv_version","alias_value":"1606.06394v1","created_at":"2026-05-18T01:04:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1606.06394","created_at":"2026-05-18T01:04:05Z"},{"alias_kind":"pith_short_12","alias_value":"GSXTXSFUTZOJ","created_at":"2026-05-18T12:30:19Z"},{"alias_kind":"pith_short_16","alias_value":"GSXTXSFUTZOJQPUS","created_at":"2026-05-18T12:30:19Z"},{"alias_kind":"pith_short_8","alias_value":"GSXTXSFU","created_at":"2026-05-18T12:30:19Z"}],"graph_snapshots":[{"event_id":"sha256:538ce2aebe0acafddde40f03b3efd43497b81d896cef7731a1d21b3fc912ed74","target":"graph","created_at":"2026-05-18T01:04:05Z","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":"We report results of joint experimental and theoretical studies on magnetoelectric (ME) compounds Co4Nb2O9 and Co4Ta2O9. On the experimental side, we present results of the magnetization and dielectric permittivity measurements in the magnetic field. On the theoretical side, we construct the low-energy Hubbard-type model for the magnetically active Co 3d bands in the Wannier basis, using the input of first-principles electronic structure calculations, solve this model in the mean-field Hartree-Fock approximation, and evaluate the electric polarization in terms of the Berry phase theory. Both e","authors_text":"I. V. Solovyev, T. V. Kolodiazhnyi","cross_cats":["cond-mat.str-el"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2016-06-21T01:48:53Z","title":"Experimental and first-principles studies of magnetism and magnetoelectric effect in Co4Nb2O9 and Co4Ta2O9"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1606.06394","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:d0847d26bba6c32031fb48c49bddcb7c17810e5cbc9bdce05296530297711afc","target":"record","created_at":"2026-05-18T01:04:05Z","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":"3055afd68b89f9d76c96363cc4be92693e903fb0e2b89d8508db06223ce11ce2","cross_cats_sorted":["cond-mat.str-el"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2016-06-21T01:48:53Z","title_canon_sha256":"63ece944453d64e2b465772f4cc19d6ec63c161a839658fad3437a4583cb51fa"},"schema_version":"1.0","source":{"id":"1606.06394","kind":"arxiv","version":1}},"canonical_sha256":"34af3bc8b49e5c983e9247f1d766377a2d99d6d9fd7045cfebfb0fc52c400da6","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"34af3bc8b49e5c983e9247f1d766377a2d99d6d9fd7045cfebfb0fc52c400da6","first_computed_at":"2026-05-18T01:04:05.448554Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:04:05.448554Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"c+NK2LD1rt+Te1JHel+aVyoH/HfV7cCiGO2ja9O1dYD6lAjU4ts8ALsoAQFWziZyqw//1UjhMtCd/2y4acM2DQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:04:05.449038Z","signed_message":"canonical_sha256_bytes"},"source_id":"1606.06394","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d0847d26bba6c32031fb48c49bddcb7c17810e5cbc9bdce05296530297711afc","sha256:538ce2aebe0acafddde40f03b3efd43497b81d896cef7731a1d21b3fc912ed74"],"state_sha256":"75995f9d0cdb07041d61a656f59ae32ae6045bdde0483e0a0adee5097c094999"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"MNVmg1w0flHGzlFqNjLtwe2ftEufbP/mZ7IAeAc4TDZCScfZwYheemFyltblP5yabTaqIkp7TA5hKSTVVop3DA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T22:15:37.992672Z","bundle_sha256":"323b332ecf2d3c6723632a259a6f03df91d734ad67d801b78413d26e973636ca"}}