{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2023:I6TGTLR6LX45763U7TJK2TY32L","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":"b98d1e036ba71910529cedcdcb3c1e674e943d9d7386a58cdd91cc67b1982532","cross_cats_sorted":["cond-mat.other"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2023-06-07T17:52:58Z","title_canon_sha256":"461d5662992edfa3c1ba813962323ad9ff4afc4abd3749d2b9ee8601ad4e403d"},"schema_version":"1.0","source":{"id":"2306.04624","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2306.04624","created_at":"2026-07-05T06:18:33Z"},{"alias_kind":"arxiv_version","alias_value":"2306.04624v1","created_at":"2026-07-05T06:18:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2306.04624","created_at":"2026-07-05T06:18:33Z"},{"alias_kind":"pith_short_12","alias_value":"I6TGTLR6LX45","created_at":"2026-07-05T06:18:33Z"},{"alias_kind":"pith_short_16","alias_value":"I6TGTLR6LX45763U","created_at":"2026-07-05T06:18:33Z"},{"alias_kind":"pith_short_8","alias_value":"I6TGTLR6","created_at":"2026-07-05T06:18:33Z"}],"graph_snapshots":[{"event_id":"sha256:099870808d9af3333b85aa1b6213105bc935b8859444b465b315138833ac594f","target":"graph","created_at":"2026-07-05T06:18:33Z","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/2306.04624/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present an \\textit{ab-initio} study of the quasi-2D layered perovskite Sr$_3$Hf$_2$O$_7$ com\\-pound, performed within the framework of the Density Functional Theory and lattice dynamics analysis. At high temperatures, this compound takes a \\textit{I4/mmm} centrosym\\-met\\-ric structure (S.G. n. 139); as the temperature is lowered, the symmetry is broken into other intermediate polymorphs before reaching the ground state structure, which is the \\textit{Cmc2$_1$} ferroelectric phase (S.G. n. 36). One of these intermediate polymorphs is the \\textit{Ccce} structural phase (S.G. n. 68). Additiona","authors_text":"A. M. L. Lopes, E. Lora da Silva, H. M. Petrilli, J. P. Ara\\'ujo, L. V. C. Assali, M. C. B. Barbosa, M. L. Marcondes, P. Neenu Lekshmi","cross_cats":["cond-mat.other"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2023-06-07T17:52:58Z","title":"Pressure-Induced Phase Transformations of Quasi-2D Sr$_3$Hf$_2$O$_7$"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2306.04624","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":"sha256:5cb215edc707356fdc5c0258dfec5f9789d4c5c76b67fa6c81e75b7eae18619e","target":"record","created_at":"2026-07-05T06:18:33Z","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":"b98d1e036ba71910529cedcdcb3c1e674e943d9d7386a58cdd91cc67b1982532","cross_cats_sorted":["cond-mat.other"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2023-06-07T17:52:58Z","title_canon_sha256":"461d5662992edfa3c1ba813962323ad9ff4afc4abd3749d2b9ee8601ad4e403d"},"schema_version":"1.0","source":{"id":"2306.04624","kind":"arxiv","version":1}},"canonical_sha256":"47a669ae3e5df9dffb74fcd2ad4f1bd2d8037cf055af0e88e6d77b67c9a08b0f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"47a669ae3e5df9dffb74fcd2ad4f1bd2d8037cf055af0e88e6d77b67c9a08b0f","first_computed_at":"2026-07-05T06:18:33.246253Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T06:18:33.246253Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Fz0sjUxK45DUjAR2TwoQ7h5slG5+wnd1E2VzYI2YXJD52hxovP9RXnuZVaDN3wPe0JUZyZIS0dnam7muI9Y3Cg==","signature_status":"signed_v1","signed_at":"2026-07-05T06:18:33.246837Z","signed_message":"canonical_sha256_bytes"},"source_id":"2306.04624","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5cb215edc707356fdc5c0258dfec5f9789d4c5c76b67fa6c81e75b7eae18619e","sha256:099870808d9af3333b85aa1b6213105bc935b8859444b465b315138833ac594f"],"state_sha256":"b22e6c98f840b82a10207216e6c1a112f1f4496cd2e65b6e33866b1d2788c83f"}