{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:PYH544I2QXES4P5YGSXZA5CSRX","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":"74b36a77cf45e8966adb299b11bc01fe0698dcc9790d5eafeeb1a3eb57070c02","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2015-10-30T18:21:39Z","title_canon_sha256":"f49309c0f63ea23ffc724b70d586510d99d58678ed4afd981823fac6c39f6979"},"schema_version":"1.0","source":{"id":"1510.09181","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1510.09181","created_at":"2026-05-18T01:20:09Z"},{"alias_kind":"arxiv_version","alias_value":"1510.09181v2","created_at":"2026-05-18T01:20:09Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1510.09181","created_at":"2026-05-18T01:20:09Z"},{"alias_kind":"pith_short_12","alias_value":"PYH544I2QXES","created_at":"2026-05-18T12:29:37Z"},{"alias_kind":"pith_short_16","alias_value":"PYH544I2QXES4P5Y","created_at":"2026-05-18T12:29:37Z"},{"alias_kind":"pith_short_8","alias_value":"PYH544I2","created_at":"2026-05-18T12:29:37Z"}],"graph_snapshots":[{"event_id":"sha256:cf3339110a21b7a8c1720e71663e881b39f8cad21eecb2f2378dfc073e694aa7","target":"graph","created_at":"2026-05-18T01:20:09Z","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 investigate the strain dependence of the ferroelectric polarization and the structure of the ferroelectric domain walls in the layered perovskite-related barium fluorides, BaMF$_4$ (M=Mg, Zn). The unusual \"geometric ferroelectricity\" in these materials is driven by the softening of a single polar phonon mode consisting of rotations of the MF$_6$ octahedra accompanied by polar displacements of the Ba cations, and in contrast to conventional ferroelectrics involves minimal electronic rehybridization. We therefore anticipate a different strain dependence of the polarization, and alternative do","authors_text":"Hendrik Th. Spanke, Maribel N\\'u\\~nez Valdez, Nicola A. Spaldin","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2015-10-30T18:21:39Z","title":"Ab initio study of the ferroelectric strain dependence and 180$^\\circ$ domain walls in the barium metal fluorides BaMgF$_4$ and BaZnF$_4$"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1510.09181","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":"sha256:90b1b853e679eb361c75c062b77b60fec8f85654849dd3d82c66be3374aff8e8","target":"record","created_at":"2026-05-18T01:20:09Z","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":"74b36a77cf45e8966adb299b11bc01fe0698dcc9790d5eafeeb1a3eb57070c02","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2015-10-30T18:21:39Z","title_canon_sha256":"f49309c0f63ea23ffc724b70d586510d99d58678ed4afd981823fac6c39f6979"},"schema_version":"1.0","source":{"id":"1510.09181","kind":"arxiv","version":2}},"canonical_sha256":"7e0fde711a85c92e3fb834af9074528dd9325f7ca8a3fd4f93b755fdba5bcc15","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7e0fde711a85c92e3fb834af9074528dd9325f7ca8a3fd4f93b755fdba5bcc15","first_computed_at":"2026-05-18T01:20:09.153766Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:20:09.153766Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"sFEVznx3tBnifYm+j7m1w/leaxRVSc3dt6x8E5mTUfGgvSGnB8vvYSBa/AD2SbqY+LqBwI6vMy0SC7In/tBsCw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:20:09.154367Z","signed_message":"canonical_sha256_bytes"},"source_id":"1510.09181","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:90b1b853e679eb361c75c062b77b60fec8f85654849dd3d82c66be3374aff8e8","sha256:cf3339110a21b7a8c1720e71663e881b39f8cad21eecb2f2378dfc073e694aa7"],"state_sha256":"c357e338d17d52a4c908d40e5178f1840fecad46e3f1a2b293ae9e2f82991004"}