{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:XVMO5APHGNCRNJK32MJJB6DJXG","short_pith_number":"pith:XVMO5APH","canonical_record":{"source":{"id":"1407.1008","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2014-07-03T18:36:46Z","cross_cats_sorted":[],"title_canon_sha256":"5d20c4079f1500b9a885574e5fb6d7f54f8baa775f46dee8409a19948e3e3780","abstract_canon_sha256":"a5c0005240bfe228da6520aef78f521bdde156256b8ba28750ad29606b87051e"},"schema_version":"1.0"},"canonical_sha256":"bd58ee81e7334516a55bd31290f869b99ae333a65727b810de810614282d3643","source":{"kind":"arxiv","id":"1407.1008","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1407.1008","created_at":"2026-05-18T02:44:08Z"},{"alias_kind":"arxiv_version","alias_value":"1407.1008v1","created_at":"2026-05-18T02:44:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1407.1008","created_at":"2026-05-18T02:44:08Z"},{"alias_kind":"pith_short_12","alias_value":"XVMO5APHGNCR","created_at":"2026-05-18T12:28:57Z"},{"alias_kind":"pith_short_16","alias_value":"XVMO5APHGNCRNJK3","created_at":"2026-05-18T12:28:57Z"},{"alias_kind":"pith_short_8","alias_value":"XVMO5APH","created_at":"2026-05-18T12:28:57Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:XVMO5APHGNCRNJK32MJJB6DJXG","target":"record","payload":{"canonical_record":{"source":{"id":"1407.1008","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2014-07-03T18:36:46Z","cross_cats_sorted":[],"title_canon_sha256":"5d20c4079f1500b9a885574e5fb6d7f54f8baa775f46dee8409a19948e3e3780","abstract_canon_sha256":"a5c0005240bfe228da6520aef78f521bdde156256b8ba28750ad29606b87051e"},"schema_version":"1.0"},"canonical_sha256":"bd58ee81e7334516a55bd31290f869b99ae333a65727b810de810614282d3643","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:44:08.097348Z","signature_b64":"BblonQ35MYVf+QU+iNzGHnsQJopMcZAxqsfo1b2VgznWhsaUd0tPSUBvwMRoDpzSdGreAFMV/QV2DctIGD/iAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"bd58ee81e7334516a55bd31290f869b99ae333a65727b810de810614282d3643","last_reissued_at":"2026-05-18T02:44:08.096921Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:44:08.096921Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1407.1008","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":"2026-05-18T02:44:08Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bgZBp2qTWbIT13KbvtVAtj4gq1uQq6khkAqrIWAv8nz0v/pdUciT53liaQrh85qcwcNlbRB1fhsNXaX2rbQXCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T19:35:32.031084Z"},"content_sha256":"9d176c15c39b355b486cfbd1c210fae1eae17ee01453967da7c902e833a92920","schema_version":"1.0","event_id":"sha256:9d176c15c39b355b486cfbd1c210fae1eae17ee01453967da7c902e833a92920"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:XVMO5APHGNCRNJK32MJJB6DJXG","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Pathways Towards Ferroelectricity in Hafnia","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"George A. Rossetti, Jr., Rampi Ramprasad, Tran Doan Huan, Vinit Sharma","submitted_at":"2014-07-03T18:36:46Z","abstract_excerpt":"The question of whether one can systematically identify (previously unknown) ferroelectric phases of a given material is addressed, taking hafnia (HfO$_2$) as an example. Low free energy phases at various pressures and temperatures are identified using a first-principles based structure search algorithm. Ferroelectric phases are then recognized by exploiting group theoretical principles for the symmetry-allowed displacive transitions between non-polar and polar phases. Two orthorhombic polar phases occurring in space groups $Pca2_1$ and $Pmn2_1$ are singled out as the most viable ferroelectric"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1407.1008","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":"2026-05-18T02:44:08Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"OCpAs3qugjyUpmpRLOYEHrlzBUzb+IuA931k0B/Vpvo260CL9ieIFl4JLtvCrSlAa+jxCRAgPRPz5E78pkERDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T19:35:32.031704Z"},"content_sha256":"b4554706dc488a5f64dbfb4131d778f6ca9d63514b67854fe40791392177cb29","schema_version":"1.0","event_id":"sha256:b4554706dc488a5f64dbfb4131d778f6ca9d63514b67854fe40791392177cb29"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/XVMO5APHGNCRNJK32MJJB6DJXG/bundle.json","state_url":"https://pith.science/pith/XVMO5APHGNCRNJK32MJJB6DJXG/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/XVMO5APHGNCRNJK32MJJB6DJXG/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":"2026-05-26T19:35:32Z","links":{"resolver":"https://pith.science/pith/XVMO5APHGNCRNJK32MJJB6DJXG","bundle":"https://pith.science/pith/XVMO5APHGNCRNJK32MJJB6DJXG/bundle.json","state":"https://pith.science/pith/XVMO5APHGNCRNJK32MJJB6DJXG/state.json","well_known_bundle":"https://pith.science/.well-known/pith/XVMO5APHGNCRNJK32MJJB6DJXG/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:XVMO5APHGNCRNJK32MJJB6DJXG","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":"a5c0005240bfe228da6520aef78f521bdde156256b8ba28750ad29606b87051e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2014-07-03T18:36:46Z","title_canon_sha256":"5d20c4079f1500b9a885574e5fb6d7f54f8baa775f46dee8409a19948e3e3780"},"schema_version":"1.0","source":{"id":"1407.1008","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1407.1008","created_at":"2026-05-18T02:44:08Z"},{"alias_kind":"arxiv_version","alias_value":"1407.1008v1","created_at":"2026-05-18T02:44:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1407.1008","created_at":"2026-05-18T02:44:08Z"},{"alias_kind":"pith_short_12","alias_value":"XVMO5APHGNCR","created_at":"2026-05-18T12:28:57Z"},{"alias_kind":"pith_short_16","alias_value":"XVMO5APHGNCRNJK3","created_at":"2026-05-18T12:28:57Z"},{"alias_kind":"pith_short_8","alias_value":"XVMO5APH","created_at":"2026-05-18T12:28:57Z"}],"graph_snapshots":[{"event_id":"sha256:b4554706dc488a5f64dbfb4131d778f6ca9d63514b67854fe40791392177cb29","target":"graph","created_at":"2026-05-18T02:44:08Z","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":"The question of whether one can systematically identify (previously unknown) ferroelectric phases of a given material is addressed, taking hafnia (HfO$_2$) as an example. Low free energy phases at various pressures and temperatures are identified using a first-principles based structure search algorithm. Ferroelectric phases are then recognized by exploiting group theoretical principles for the symmetry-allowed displacive transitions between non-polar and polar phases. Two orthorhombic polar phases occurring in space groups $Pca2_1$ and $Pmn2_1$ are singled out as the most viable ferroelectric","authors_text":"George A. Rossetti, Jr., Rampi Ramprasad, Tran Doan Huan, Vinit Sharma","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2014-07-03T18:36:46Z","title":"Pathways Towards Ferroelectricity in Hafnia"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1407.1008","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":"sha256:9d176c15c39b355b486cfbd1c210fae1eae17ee01453967da7c902e833a92920","target":"record","created_at":"2026-05-18T02:44:08Z","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":"a5c0005240bfe228da6520aef78f521bdde156256b8ba28750ad29606b87051e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2014-07-03T18:36:46Z","title_canon_sha256":"5d20c4079f1500b9a885574e5fb6d7f54f8baa775f46dee8409a19948e3e3780"},"schema_version":"1.0","source":{"id":"1407.1008","kind":"arxiv","version":1}},"canonical_sha256":"bd58ee81e7334516a55bd31290f869b99ae333a65727b810de810614282d3643","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"bd58ee81e7334516a55bd31290f869b99ae333a65727b810de810614282d3643","first_computed_at":"2026-05-18T02:44:08.096921Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:44:08.096921Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"BblonQ35MYVf+QU+iNzGHnsQJopMcZAxqsfo1b2VgznWhsaUd0tPSUBvwMRoDpzSdGreAFMV/QV2DctIGD/iAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:44:08.097348Z","signed_message":"canonical_sha256_bytes"},"source_id":"1407.1008","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9d176c15c39b355b486cfbd1c210fae1eae17ee01453967da7c902e833a92920","sha256:b4554706dc488a5f64dbfb4131d778f6ca9d63514b67854fe40791392177cb29"],"state_sha256":"f8e03ca5a4897a9c9d27d566ae9af2f685da8e04927c7a48dfa84720e2d023b7"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"g84qJs95E5KLrh+03iy1gUZzrJKYQb93nFmZ6/m9OrboBPvgycenAXJ8XC/x6koQgsSqUhJeNk+gF5CTlyCXBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T19:35:32.034887Z","bundle_sha256":"76efb3bea8f2fe89bf32c08aacab7e8d280daa03cae2eeadf2e93a858c6b96cc"}}