{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:ANDOXGGBUQWAKMFWRJ3UGZ2CTR","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":"160bbaa88a396f7b22ea2067363ad448a3c59e981a0596ec861b06e5a801bad9","cross_cats_sorted":["physics.comp-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2012-07-13T18:10:09Z","title_canon_sha256":"16d50eb4802f7a4c74525c0ab63ffabfccafd4d4c139b4754376339fa7f50aa4"},"schema_version":"1.0","source":{"id":"1207.3320","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1207.3320","created_at":"2026-05-18T03:51:02Z"},{"alias_kind":"arxiv_version","alias_value":"1207.3320v1","created_at":"2026-05-18T03:51:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1207.3320","created_at":"2026-05-18T03:51:02Z"},{"alias_kind":"pith_short_12","alias_value":"ANDOXGGBUQWA","created_at":"2026-05-18T12:26:58Z"},{"alias_kind":"pith_short_16","alias_value":"ANDOXGGBUQWAKMFW","created_at":"2026-05-18T12:26:58Z"},{"alias_kind":"pith_short_8","alias_value":"ANDOXGGB","created_at":"2026-05-18T12:26:58Z"}],"graph_snapshots":[{"event_id":"sha256:0ca6d2fc43d769da771fda1fde67d3efb2f62a1c7355177aa2a14de9d22cdf1b","target":"graph","created_at":"2026-05-18T03:51:02Z","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":"Group I/II materials exhibit unexpected structural phase transitions at high pressures, providing potential insight into the origins of elemental superconductivity. We present here a computational study of elemental barium and binary sodium-calcium alloys to identify both known and unknown phases of barium under pressure, as well as stable high-pressure compounds in the immiscible Na-Ca system. To predict stability, we performed density functional theory calculations on randomly generated structures and evolved them using a genetic algorithm. For barium, we observed all of the expected phases ","authors_text":"Joshua A. Taillon, Richard G. Hennig, William W. Tipton","cross_cats":["physics.comp-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2012-07-13T18:10:09Z","title":"Ab Initio Discovery of Novel Crystal Structure Stability in Barium and Sodium-Calcium Compounds under Pressure using DFT"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1207.3320","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":"sha256:9d7474e2fb3222318bb429f26d3a868a708073675f41cbc0fbca41ee225eb44a","target":"record","created_at":"2026-05-18T03:51:02Z","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":"160bbaa88a396f7b22ea2067363ad448a3c59e981a0596ec861b06e5a801bad9","cross_cats_sorted":["physics.comp-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2012-07-13T18:10:09Z","title_canon_sha256":"16d50eb4802f7a4c74525c0ab63ffabfccafd4d4c139b4754376339fa7f50aa4"},"schema_version":"1.0","source":{"id":"1207.3320","kind":"arxiv","version":1}},"canonical_sha256":"0346eb98c1a42c0530b68a774367429c47f4e7b7de15682f1d84ff25b9e0aecd","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0346eb98c1a42c0530b68a774367429c47f4e7b7de15682f1d84ff25b9e0aecd","first_computed_at":"2026-05-18T03:51:02.698642Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:51:02.698642Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"o//JqYKg9TEdPXr1LXDOCZvN6GEPHJpDzXshL2gqgJf37mE2dqWf8nl/vJNwNPTZrFTrZa72tyYKxhF6Dc+1AQ==","signature_status":"signed_v1","signed_at":"2026-05-18T03:51:02.699222Z","signed_message":"canonical_sha256_bytes"},"source_id":"1207.3320","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9d7474e2fb3222318bb429f26d3a868a708073675f41cbc0fbca41ee225eb44a","sha256:0ca6d2fc43d769da771fda1fde67d3efb2f62a1c7355177aa2a14de9d22cdf1b"],"state_sha256":"03844c8bc3c516f084ea16da79efb0b989f0cc43ea1fb812c806cdc130bf7d81"}