{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:FFW675WKGEJ6PU5DO4ZTXYGRDF","short_pith_number":"pith:FFW675WK","canonical_record":{"source":{"id":"2102.08856","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2021-02-17T16:35:59Z","cross_cats_sorted":["physics.comp-ph"],"title_canon_sha256":"9ce3aac995be00eeba5f759508921f66bed9c9376dbc3a4216f8ca3755a1c70d","abstract_canon_sha256":"2aa0d78c52d49ba6296c3bb88a09f481a625c74e18cf328be6805748c56e1292"},"schema_version":"1.0"},"canonical_sha256":"296deff6ca3113e7d3a377333be0d119636e4278d90c000741af6e29dbb1a474","source":{"kind":"arxiv","id":"2102.08856","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2102.08856","created_at":"2026-07-05T02:16:53Z"},{"alias_kind":"arxiv_version","alias_value":"2102.08856v2","created_at":"2026-07-05T02:16:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2102.08856","created_at":"2026-07-05T02:16:53Z"},{"alias_kind":"pith_short_12","alias_value":"FFW675WKGEJ6","created_at":"2026-07-05T02:16:53Z"},{"alias_kind":"pith_short_16","alias_value":"FFW675WKGEJ6PU5D","created_at":"2026-07-05T02:16:53Z"},{"alias_kind":"pith_short_8","alias_value":"FFW675WK","created_at":"2026-07-05T02:16:53Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:FFW675WKGEJ6PU5DO4ZTXYGRDF","target":"record","payload":{"canonical_record":{"source":{"id":"2102.08856","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2021-02-17T16:35:59Z","cross_cats_sorted":["physics.comp-ph"],"title_canon_sha256":"9ce3aac995be00eeba5f759508921f66bed9c9376dbc3a4216f8ca3755a1c70d","abstract_canon_sha256":"2aa0d78c52d49ba6296c3bb88a09f481a625c74e18cf328be6805748c56e1292"},"schema_version":"1.0"},"canonical_sha256":"296deff6ca3113e7d3a377333be0d119636e4278d90c000741af6e29dbb1a474","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:16:53.925433Z","signature_b64":"+b/txSI+Oe0ci0Hp6XNBRwB9ueLhyX7ZoJCepU3vOWPWWZYjkOXapBQ+Ffj0Oztg6g+8u2B3wCapESDIxYtkCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"296deff6ca3113e7d3a377333be0d119636e4278d90c000741af6e29dbb1a474","last_reissued_at":"2026-07-05T02:16:53.925045Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:16:53.925045Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2102.08856","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":"2026-07-05T02:16:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"r+qs0xLwYays3mLhk7K5FLYNGFPKbfRbYCCi+l5G2rcQoMCEdyeblmmk0IKWBF/rpeoxYS42xFDxPxE6B9R8Dw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T13:20:23.292452Z"},"content_sha256":"2674b7138a8177751f37b06382dcb7f43d80d2065ae9c2781661756d3c124d0a","schema_version":"1.0","event_id":"sha256:2674b7138a8177751f37b06382dcb7f43d80d2065ae9c2781661756d3c124d0a"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:FFW675WKGEJ6PU5DO4ZTXYGRDF","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A re-examination of antiferroelectric PbZrO$_3$ and PbHfO$_3$: an 80-atom $Pnam$ structure","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["physics.comp-ph"],"primary_cat":"cond-mat.mtrl-sci","authors_text":"A. M. Glazer, B. Xu, D. R. Bowler, G. Catalan, J. Hlinka, J. K. Shenton, J. S. Baker, M. Pa\\'sciak, P. M\\'arton, P. Vales-Castro, R. G. Burkovsky","submitted_at":"2021-02-17T16:35:59Z","abstract_excerpt":"First principles density functional theory (DFT) simulations of antiferroelectric (AFE) PbZrO$_3$ and PbHfO$_3$ reveal a dynamical instability in the phonon spectra of their purported low temperature $Pbam$ ground states. This instability doubles the $c$-axis of $Pbam$ and condenses five new small amplitude phonon modes giving rise to an 80-atom $Pnam$ structure. Compared with $Pbam$, the stability of this structure is slightly enhanced and highly reproducible as demonstrated through using different DFT codes and different treatments of electronic exchange & correlation interactions. This sugg"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2102.08856","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2102.08856/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T02:16:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"sQ0Bm4iZ00VD7355FVrXc2bT92c9LIcubE6rV3Gpyvwigyaj6BEvu0HfrzvtK4tVq/l6P/uA7mDx0L1LbvpJBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T13:20:23.293032Z"},"content_sha256":"6a479cf06210dda8c464065882dee17919dc2fc7682222e1004ead918c08e773","schema_version":"1.0","event_id":"sha256:6a479cf06210dda8c464065882dee17919dc2fc7682222e1004ead918c08e773"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/FFW675WKGEJ6PU5DO4ZTXYGRDF/bundle.json","state_url":"https://pith.science/pith/FFW675WKGEJ6PU5DO4ZTXYGRDF/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/FFW675WKGEJ6PU5DO4ZTXYGRDF/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":"2026-08-16T13:20:23Z","links":{"resolver":"https://pith.science/pith/FFW675WKGEJ6PU5DO4ZTXYGRDF","bundle":"https://pith.science/pith/FFW675WKGEJ6PU5DO4ZTXYGRDF/bundle.json","state":"https://pith.science/pith/FFW675WKGEJ6PU5DO4ZTXYGRDF/state.json","well_known_bundle":"https://pith.science/.well-known/pith/FFW675WKGEJ6PU5DO4ZTXYGRDF/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:FFW675WKGEJ6PU5DO4ZTXYGRDF","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":"2aa0d78c52d49ba6296c3bb88a09f481a625c74e18cf328be6805748c56e1292","cross_cats_sorted":["physics.comp-ph"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2021-02-17T16:35:59Z","title_canon_sha256":"9ce3aac995be00eeba5f759508921f66bed9c9376dbc3a4216f8ca3755a1c70d"},"schema_version":"1.0","source":{"id":"2102.08856","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2102.08856","created_at":"2026-07-05T02:16:53Z"},{"alias_kind":"arxiv_version","alias_value":"2102.08856v2","created_at":"2026-07-05T02:16:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2102.08856","created_at":"2026-07-05T02:16:53Z"},{"alias_kind":"pith_short_12","alias_value":"FFW675WKGEJ6","created_at":"2026-07-05T02:16:53Z"},{"alias_kind":"pith_short_16","alias_value":"FFW675WKGEJ6PU5D","created_at":"2026-07-05T02:16:53Z"},{"alias_kind":"pith_short_8","alias_value":"FFW675WK","created_at":"2026-07-05T02:16:53Z"}],"graph_snapshots":[{"event_id":"sha256:6a479cf06210dda8c464065882dee17919dc2fc7682222e1004ead918c08e773","target":"graph","created_at":"2026-07-05T02:16:53Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2102.08856/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"First principles density functional theory (DFT) simulations of antiferroelectric (AFE) PbZrO$_3$ and PbHfO$_3$ reveal a dynamical instability in the phonon spectra of their purported low temperature $Pbam$ ground states. This instability doubles the $c$-axis of $Pbam$ and condenses five new small amplitude phonon modes giving rise to an 80-atom $Pnam$ structure. Compared with $Pbam$, the stability of this structure is slightly enhanced and highly reproducible as demonstrated through using different DFT codes and different treatments of electronic exchange & correlation interactions. This sugg","authors_text":"A. M. Glazer, B. Xu, D. R. Bowler, G. Catalan, J. Hlinka, J. K. Shenton, J. S. Baker, M. Pa\\'sciak, P. M\\'arton, P. Vales-Castro, R. G. Burkovsky","cross_cats":["physics.comp-ph"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2021-02-17T16:35:59Z","title":"A re-examination of antiferroelectric PbZrO$_3$ and PbHfO$_3$: an 80-atom $Pnam$ structure"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2102.08856","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":"sha256:2674b7138a8177751f37b06382dcb7f43d80d2065ae9c2781661756d3c124d0a","target":"record","created_at":"2026-07-05T02:16:53Z","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":"2aa0d78c52d49ba6296c3bb88a09f481a625c74e18cf328be6805748c56e1292","cross_cats_sorted":["physics.comp-ph"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2021-02-17T16:35:59Z","title_canon_sha256":"9ce3aac995be00eeba5f759508921f66bed9c9376dbc3a4216f8ca3755a1c70d"},"schema_version":"1.0","source":{"id":"2102.08856","kind":"arxiv","version":2}},"canonical_sha256":"296deff6ca3113e7d3a377333be0d119636e4278d90c000741af6e29dbb1a474","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"296deff6ca3113e7d3a377333be0d119636e4278d90c000741af6e29dbb1a474","first_computed_at":"2026-07-05T02:16:53.925045Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:16:53.925045Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"+b/txSI+Oe0ci0Hp6XNBRwB9ueLhyX7ZoJCepU3vOWPWWZYjkOXapBQ+Ffj0Oztg6g+8u2B3wCapESDIxYtkCg==","signature_status":"signed_v1","signed_at":"2026-07-05T02:16:53.925433Z","signed_message":"canonical_sha256_bytes"},"source_id":"2102.08856","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2674b7138a8177751f37b06382dcb7f43d80d2065ae9c2781661756d3c124d0a","sha256:6a479cf06210dda8c464065882dee17919dc2fc7682222e1004ead918c08e773"],"state_sha256":"fbee8d100c86b75f2b0d25d6870bec01a24ab4a9861c24deecddfb4ead5fee06"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"AFxoLPqdbgC/EJgA9qzf+ySOzmxR+S13yxcWVywTq1XSJ/8UpOqjs88/sQtYITmO1h61BQ21wLwlaWCTrZ8NDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-16T13:20:23.298103Z","bundle_sha256":"ab49c4bbe816dc2d568fd5e81ab40fbf1104dd71a9468567536d420d9d8f5eb6"}}