{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:IZG7LL3QKGCDSBMSGHG2FIA7EY","short_pith_number":"pith:IZG7LL3Q","canonical_record":{"source":{"id":"1108.2915","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2011-08-15T01:44:10Z","cross_cats_sorted":[],"title_canon_sha256":"6569899e081890b9f3547e32d1c0422b7ad2bbad47b6fb3f91ec6b3f099dbc12","abstract_canon_sha256":"371fc38c81fee1b6f95636a722173e2fc789206ec5eb619b896ea2375d59d6f4"},"schema_version":"1.0"},"canonical_sha256":"464df5af70518439059231cda2a01f2621152b56f083d3335030acd2c3abc852","source":{"kind":"arxiv","id":"1108.2915","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1108.2915","created_at":"2026-05-18T02:00:54Z"},{"alias_kind":"arxiv_version","alias_value":"1108.2915v2","created_at":"2026-05-18T02:00:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1108.2915","created_at":"2026-05-18T02:00:54Z"},{"alias_kind":"pith_short_12","alias_value":"IZG7LL3QKGCD","created_at":"2026-05-18T12:26:32Z"},{"alias_kind":"pith_short_16","alias_value":"IZG7LL3QKGCDSBMS","created_at":"2026-05-18T12:26:32Z"},{"alias_kind":"pith_short_8","alias_value":"IZG7LL3Q","created_at":"2026-05-18T12:26:32Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:IZG7LL3QKGCDSBMSGHG2FIA7EY","target":"record","payload":{"canonical_record":{"source":{"id":"1108.2915","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2011-08-15T01:44:10Z","cross_cats_sorted":[],"title_canon_sha256":"6569899e081890b9f3547e32d1c0422b7ad2bbad47b6fb3f91ec6b3f099dbc12","abstract_canon_sha256":"371fc38c81fee1b6f95636a722173e2fc789206ec5eb619b896ea2375d59d6f4"},"schema_version":"1.0"},"canonical_sha256":"464df5af70518439059231cda2a01f2621152b56f083d3335030acd2c3abc852","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:00:54.047483Z","signature_b64":"F4AlE9pnIjmNK8m8rl2/7eJ7XaN3New2tkkQMy3u/anDGweTiwpnrrXBhr6GStHJxiHYCjGEPMb1ECrw/ZpPAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"464df5af70518439059231cda2a01f2621152b56f083d3335030acd2c3abc852","last_reissued_at":"2026-05-18T02:00:54.046727Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:00:54.046727Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1108.2915","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":"2026-05-18T02:00:54Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3UXKKrZ4t6/Y5CUqCdXa6ruvPlArdgvglXisUJUrqm7vWMYcltf39IM/M+yI2/Ukdjq/Pr8AOf5HYli7x1zwBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T09:23:41.180889Z"},"content_sha256":"9977030b5069ddec5076e5ab9ba15388c9b655aa67224ded8fafb66f95597746","schema_version":"1.0","event_id":"sha256:9977030b5069ddec5076e5ab9ba15388c9b655aa67224ded8fafb66f95597746"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:IZG7LL3QKGCDSBMSGHG2FIA7EY","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Polar octahedral rotations: a path to new multifunctional materials","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Andrew T. Mulder, Craig J. Fennie, Nicole A. Benedek","submitted_at":"2011-08-15T01:44:10Z","abstract_excerpt":"Perovskite ABO$_3$ oxides display an amazing variety of phenomena that can be altered by subtle changes in the chemistry and internal structure, making them a favorite class of materials to explore the rational design of novel properties. Here we highlight a recent advance in which rotations of the BO$_6$ octahedra give rise to a novel form of ferroelectricity -- hybrid improper ferroelectricity. Octahedral rotations also strongly influence other structural, magnetic, orbital, and electronic degrees of freedom in perovskites and related materials. Octahedral rotation-driven ferroelectricity co"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1108.2915","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":"2026-05-18T02:00:54Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Zpxd4gnj9mzJsimeNKlMobQrTnv0bQguEl8/Le5VmOrXx1djfiuKfw8GwMIQ7AtYS/NAnHhxYe9eLu0z3vZ+Dg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T09:23:41.181505Z"},"content_sha256":"25aeb7dabec11b11689a7266b5a6e155a80b2b0cc22a9261abf6d1cc4b286cc0","schema_version":"1.0","event_id":"sha256:25aeb7dabec11b11689a7266b5a6e155a80b2b0cc22a9261abf6d1cc4b286cc0"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/IZG7LL3QKGCDSBMSGHG2FIA7EY/bundle.json","state_url":"https://pith.science/pith/IZG7LL3QKGCDSBMSGHG2FIA7EY/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/IZG7LL3QKGCDSBMSGHG2FIA7EY/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":"2026-05-27T09:23:41Z","links":{"resolver":"https://pith.science/pith/IZG7LL3QKGCDSBMSGHG2FIA7EY","bundle":"https://pith.science/pith/IZG7LL3QKGCDSBMSGHG2FIA7EY/bundle.json","state":"https://pith.science/pith/IZG7LL3QKGCDSBMSGHG2FIA7EY/state.json","well_known_bundle":"https://pith.science/.well-known/pith/IZG7LL3QKGCDSBMSGHG2FIA7EY/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:IZG7LL3QKGCDSBMSGHG2FIA7EY","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":"371fc38c81fee1b6f95636a722173e2fc789206ec5eb619b896ea2375d59d6f4","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2011-08-15T01:44:10Z","title_canon_sha256":"6569899e081890b9f3547e32d1c0422b7ad2bbad47b6fb3f91ec6b3f099dbc12"},"schema_version":"1.0","source":{"id":"1108.2915","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1108.2915","created_at":"2026-05-18T02:00:54Z"},{"alias_kind":"arxiv_version","alias_value":"1108.2915v2","created_at":"2026-05-18T02:00:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1108.2915","created_at":"2026-05-18T02:00:54Z"},{"alias_kind":"pith_short_12","alias_value":"IZG7LL3QKGCD","created_at":"2026-05-18T12:26:32Z"},{"alias_kind":"pith_short_16","alias_value":"IZG7LL3QKGCDSBMS","created_at":"2026-05-18T12:26:32Z"},{"alias_kind":"pith_short_8","alias_value":"IZG7LL3Q","created_at":"2026-05-18T12:26:32Z"}],"graph_snapshots":[{"event_id":"sha256:25aeb7dabec11b11689a7266b5a6e155a80b2b0cc22a9261abf6d1cc4b286cc0","target":"graph","created_at":"2026-05-18T02:00:54Z","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":"Perovskite ABO$_3$ oxides display an amazing variety of phenomena that can be altered by subtle changes in the chemistry and internal structure, making them a favorite class of materials to explore the rational design of novel properties. Here we highlight a recent advance in which rotations of the BO$_6$ octahedra give rise to a novel form of ferroelectricity -- hybrid improper ferroelectricity. Octahedral rotations also strongly influence other structural, magnetic, orbital, and electronic degrees of freedom in perovskites and related materials. Octahedral rotation-driven ferroelectricity co","authors_text":"Andrew T. Mulder, Craig J. Fennie, Nicole A. Benedek","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2011-08-15T01:44:10Z","title":"Polar octahedral rotations: a path to new multifunctional materials"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1108.2915","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":"sha256:9977030b5069ddec5076e5ab9ba15388c9b655aa67224ded8fafb66f95597746","target":"record","created_at":"2026-05-18T02:00:54Z","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":"371fc38c81fee1b6f95636a722173e2fc789206ec5eb619b896ea2375d59d6f4","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2011-08-15T01:44:10Z","title_canon_sha256":"6569899e081890b9f3547e32d1c0422b7ad2bbad47b6fb3f91ec6b3f099dbc12"},"schema_version":"1.0","source":{"id":"1108.2915","kind":"arxiv","version":2}},"canonical_sha256":"464df5af70518439059231cda2a01f2621152b56f083d3335030acd2c3abc852","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"464df5af70518439059231cda2a01f2621152b56f083d3335030acd2c3abc852","first_computed_at":"2026-05-18T02:00:54.046727Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:00:54.046727Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"F4AlE9pnIjmNK8m8rl2/7eJ7XaN3New2tkkQMy3u/anDGweTiwpnrrXBhr6GStHJxiHYCjGEPMb1ECrw/ZpPAA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:00:54.047483Z","signed_message":"canonical_sha256_bytes"},"source_id":"1108.2915","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9977030b5069ddec5076e5ab9ba15388c9b655aa67224ded8fafb66f95597746","sha256:25aeb7dabec11b11689a7266b5a6e155a80b2b0cc22a9261abf6d1cc4b286cc0"],"state_sha256":"09192c0165cf3f8b76b15b9b362ab6235388261e59f5e87ea5adc166762c96e3"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZBaziE7shzioX3AUdqUJ27AtcB04ISmbaCi8q6sLxGfj3692AKjDjdTFDXwyJzT3Ye8nD0BPMTqX0EgZFCE3Dw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T09:23:41.186778Z","bundle_sha256":"65b49c273d8f6abc5d4e50ddb393be1200ba29e7b3ecd40c22830c991b7c1a39"}}