{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:NRXQAWHQY3ZCF5LR2TFCQF6DPR","short_pith_number":"pith:NRXQAWHQ","canonical_record":{"source":{"id":"1007.4210","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2010-07-23T20:22:07Z","cross_cats_sorted":[],"title_canon_sha256":"14b836e8878c0429b71b12021be7f64fc03d25f8f25e36ef845a6ebfed91671d","abstract_canon_sha256":"e3c9599c17e190ddcddb92c239723bf34740ade7a588996e0d864521dcdc760b"},"schema_version":"1.0"},"canonical_sha256":"6c6f0058f0c6f222f571d4ca2817c37c4ceb28b97e63e6d66963111c48d962f5","source":{"kind":"arxiv","id":"1007.4210","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1007.4210","created_at":"2026-05-18T02:06:10Z"},{"alias_kind":"arxiv_version","alias_value":"1007.4210v1","created_at":"2026-05-18T02:06:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1007.4210","created_at":"2026-05-18T02:06:10Z"},{"alias_kind":"pith_short_12","alias_value":"NRXQAWHQY3ZC","created_at":"2026-05-18T12:26:10Z"},{"alias_kind":"pith_short_16","alias_value":"NRXQAWHQY3ZCF5LR","created_at":"2026-05-18T12:26:10Z"},{"alias_kind":"pith_short_8","alias_value":"NRXQAWHQ","created_at":"2026-05-18T12:26:10Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:NRXQAWHQY3ZCF5LR2TFCQF6DPR","target":"record","payload":{"canonical_record":{"source":{"id":"1007.4210","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2010-07-23T20:22:07Z","cross_cats_sorted":[],"title_canon_sha256":"14b836e8878c0429b71b12021be7f64fc03d25f8f25e36ef845a6ebfed91671d","abstract_canon_sha256":"e3c9599c17e190ddcddb92c239723bf34740ade7a588996e0d864521dcdc760b"},"schema_version":"1.0"},"canonical_sha256":"6c6f0058f0c6f222f571d4ca2817c37c4ceb28b97e63e6d66963111c48d962f5","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:06:10.906231Z","signature_b64":"YPHT0ERCAZwc6gPcOivSLFSNg8k3m6wuSsM89S/JZko47GV2/97lyWJC5nF0JJtE5DGDMwzdLCB8HVpOu1i7CA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6c6f0058f0c6f222f571d4ca2817c37c4ceb28b97e63e6d66963111c48d962f5","last_reissued_at":"2026-05-18T02:06:10.905557Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:06:10.905557Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1007.4210","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":"2026-05-18T02:06:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RHq1gwbUdFDMb27fQOuLbZKg+ff9174zIx89bBmVg8PRZfTU0XN9x157L3UFq1TnTxCaMBSZN3HUCmX4cY6ICg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-28T08:21:42.252528Z"},"content_sha256":"55062a527105c0a160b2c39381334d2d0596863df5bd6653883cf1966cce4fd9","schema_version":"1.0","event_id":"sha256:55062a527105c0a160b2c39381334d2d0596863df5bd6653883cf1966cce4fd9"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:NRXQAWHQY3ZCF5LR2TFCQF6DPR","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Ferroelectricity in strained Ca$_{0.5}$Sr$_{0.5}$TiO$_3$ from first principles","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Christopher R. Ashman, C. Stephen Hellberg, Samed Halilov","submitted_at":"2010-07-23T20:22:07Z","abstract_excerpt":"We present a density functional theory investigation of strained Ca$_{0.5}$Sr$_{0.5}$TiO$_3$. We have determined the structure and polarization for a number of arrangements of Ca and Sr in a 2$\\times$2$\\times$2 supercell. The a and b lattice vectors are strained to match the lattice constants of the rotated Si(001) face. To set the context for the CSTO study, we also include simulations of the Si(001) constrained structures for CaTiO$_3$ and SrTiO$_3$. Our primary findings are that all Ca$_{0.5}$Sr$_{0.5}$TiO$_3$ structures examined except one are ferroelectric, exhibiting polarizations rangin"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1007.4210","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":"2026-05-18T02:06:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZIvb5YejE7HiP7+D4JpgQF6Z/6p82RqFd7Wm1hmLT1tC+pgRGy/79ywrvewE5YOgLuk7MezC0e+nAawQ7S8YAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-28T08:21:42.252867Z"},"content_sha256":"da8acba362594ffff9848844e8fa068cda06a3c6ec7dcc0a57668dcf0709e9d1","schema_version":"1.0","event_id":"sha256:da8acba362594ffff9848844e8fa068cda06a3c6ec7dcc0a57668dcf0709e9d1"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/NRXQAWHQY3ZCF5LR2TFCQF6DPR/bundle.json","state_url":"https://pith.science/pith/NRXQAWHQY3ZCF5LR2TFCQF6DPR/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/NRXQAWHQY3ZCF5LR2TFCQF6DPR/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":"2026-06-28T08:21:42Z","links":{"resolver":"https://pith.science/pith/NRXQAWHQY3ZCF5LR2TFCQF6DPR","bundle":"https://pith.science/pith/NRXQAWHQY3ZCF5LR2TFCQF6DPR/bundle.json","state":"https://pith.science/pith/NRXQAWHQY3ZCF5LR2TFCQF6DPR/state.json","well_known_bundle":"https://pith.science/.well-known/pith/NRXQAWHQY3ZCF5LR2TFCQF6DPR/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:NRXQAWHQY3ZCF5LR2TFCQF6DPR","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":"e3c9599c17e190ddcddb92c239723bf34740ade7a588996e0d864521dcdc760b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2010-07-23T20:22:07Z","title_canon_sha256":"14b836e8878c0429b71b12021be7f64fc03d25f8f25e36ef845a6ebfed91671d"},"schema_version":"1.0","source":{"id":"1007.4210","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1007.4210","created_at":"2026-05-18T02:06:10Z"},{"alias_kind":"arxiv_version","alias_value":"1007.4210v1","created_at":"2026-05-18T02:06:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1007.4210","created_at":"2026-05-18T02:06:10Z"},{"alias_kind":"pith_short_12","alias_value":"NRXQAWHQY3ZC","created_at":"2026-05-18T12:26:10Z"},{"alias_kind":"pith_short_16","alias_value":"NRXQAWHQY3ZCF5LR","created_at":"2026-05-18T12:26:10Z"},{"alias_kind":"pith_short_8","alias_value":"NRXQAWHQ","created_at":"2026-05-18T12:26:10Z"}],"graph_snapshots":[{"event_id":"sha256:da8acba362594ffff9848844e8fa068cda06a3c6ec7dcc0a57668dcf0709e9d1","target":"graph","created_at":"2026-05-18T02:06:10Z","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 present a density functional theory investigation of strained Ca$_{0.5}$Sr$_{0.5}$TiO$_3$. We have determined the structure and polarization for a number of arrangements of Ca and Sr in a 2$\\times$2$\\times$2 supercell. The a and b lattice vectors are strained to match the lattice constants of the rotated Si(001) face. To set the context for the CSTO study, we also include simulations of the Si(001) constrained structures for CaTiO$_3$ and SrTiO$_3$. Our primary findings are that all Ca$_{0.5}$Sr$_{0.5}$TiO$_3$ structures examined except one are ferroelectric, exhibiting polarizations rangin","authors_text":"Christopher R. Ashman, C. Stephen Hellberg, Samed Halilov","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2010-07-23T20:22:07Z","title":"Ferroelectricity in strained Ca$_{0.5}$Sr$_{0.5}$TiO$_3$ from first principles"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1007.4210","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":"sha256:55062a527105c0a160b2c39381334d2d0596863df5bd6653883cf1966cce4fd9","target":"record","created_at":"2026-05-18T02:06:10Z","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":"e3c9599c17e190ddcddb92c239723bf34740ade7a588996e0d864521dcdc760b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2010-07-23T20:22:07Z","title_canon_sha256":"14b836e8878c0429b71b12021be7f64fc03d25f8f25e36ef845a6ebfed91671d"},"schema_version":"1.0","source":{"id":"1007.4210","kind":"arxiv","version":1}},"canonical_sha256":"6c6f0058f0c6f222f571d4ca2817c37c4ceb28b97e63e6d66963111c48d962f5","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6c6f0058f0c6f222f571d4ca2817c37c4ceb28b97e63e6d66963111c48d962f5","first_computed_at":"2026-05-18T02:06:10.905557Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:06:10.905557Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"YPHT0ERCAZwc6gPcOivSLFSNg8k3m6wuSsM89S/JZko47GV2/97lyWJC5nF0JJtE5DGDMwzdLCB8HVpOu1i7CA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:06:10.906231Z","signed_message":"canonical_sha256_bytes"},"source_id":"1007.4210","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:55062a527105c0a160b2c39381334d2d0596863df5bd6653883cf1966cce4fd9","sha256:da8acba362594ffff9848844e8fa068cda06a3c6ec7dcc0a57668dcf0709e9d1"],"state_sha256":"4940562f9d69d8e7e4da47ff2930acfef55d16c8d9f0e79b51eaf19eef410ff7"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"MaGR8FVB1a9twepjDsQ6dFQwZ1GY1HQhslhqs76n8RemWSJ129S396JO3Ub8JLHKS7O89UXIdil8I/J35N1gCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-28T08:21:42.254743Z","bundle_sha256":"50a109c9a7616b8ce7b92dbfc48472203d3e2ebf10f631118c34041324a8855f"}}