{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2019:6PCK6DQSNCRXB2CYLR4MZ6H52X","short_pith_number":"pith:6PCK6DQS","schema_version":"1.0","canonical_sha256":"f3c4af0e1268a370e8585c78ccf8fdd5ec8a54b3f31ce187612f10f2b9d7dc99","source":{"kind":"arxiv","id":"1903.07690","version":2},"attestation_state":"computed","paper":{"title":"Nature of the Structural Symmetries Associated with Hybrid Improper Ferroelectricity in Ca3X2O7","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"B. Gao, H. Zhang, J. Kim, M. Balasubramanian, S. Ghose, S. G. Wang, S. Liu, S.-W. Cheong, T. A. Tyson, Y-S. Chen, Zhenxian Liu","submitted_at":"2019-03-18T19:51:50Z","abstract_excerpt":"In hybrid improper ferroelectric systems, polarization arises from the onset of successive nonpolar lattice modes. In this work, measurements and modeling were performed to determine the spatial symmetries of the phases involved in the transitions to these modes. Structural and optical measurements reveal that the tilt and rotation distortions of the MnO6 or TiO6 polyhedra relative to the high symmetry phases driving ferroelectricity in the hybrid improper Ca3X2O7 system (X=Mn and Ti) condense at different temperatures. The tilt angle vanishes abruptly at T$_T$ ~ 400 K for Ca3Mn2O7 (and contin"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1903.07690","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2019-03-18T19:51:50Z","cross_cats_sorted":[],"title_canon_sha256":"29e7f70a2a07e8a7d2d992b36ae5a8c64ded640087138579a23f39154f04f4f7","abstract_canon_sha256":"a8e0bd49b01e92dd73a0e108c76bccb8f8eef9c8dc869c10d997ed8b98406816"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:41:42.668654Z","signature_b64":"P1cHxaMLZg9ZmlheKMSe42DmBoCZZffmNlDhoTximJKcaTdsJVGsLNmTD9lyWjS4Ecj3VZagTq31QQKTEJazDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f3c4af0e1268a370e8585c78ccf8fdd5ec8a54b3f31ce187612f10f2b9d7dc99","last_reissued_at":"2026-05-17T23:41:42.668129Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:41:42.668129Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Nature of the Structural Symmetries Associated with Hybrid Improper Ferroelectricity in Ca3X2O7","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"B. Gao, H. Zhang, J. Kim, M. Balasubramanian, S. Ghose, S. G. Wang, S. Liu, S.-W. Cheong, T. A. Tyson, Y-S. Chen, Zhenxian Liu","submitted_at":"2019-03-18T19:51:50Z","abstract_excerpt":"In hybrid improper ferroelectric systems, polarization arises from the onset of successive nonpolar lattice modes. In this work, measurements and modeling were performed to determine the spatial symmetries of the phases involved in the transitions to these modes. Structural and optical measurements reveal that the tilt and rotation distortions of the MnO6 or TiO6 polyhedra relative to the high symmetry phases driving ferroelectricity in the hybrid improper Ca3X2O7 system (X=Mn and Ti) condense at different temperatures. The tilt angle vanishes abruptly at T$_T$ ~ 400 K for Ca3Mn2O7 (and contin"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1903.07690","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":""},"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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1903.07690","created_at":"2026-05-17T23:41:42.668198+00:00"},{"alias_kind":"arxiv_version","alias_value":"1903.07690v2","created_at":"2026-05-17T23:41:42.668198+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1903.07690","created_at":"2026-05-17T23:41:42.668198+00:00"},{"alias_kind":"pith_short_12","alias_value":"6PCK6DQSNCRX","created_at":"2026-05-18T12:33:10.108867+00:00"},{"alias_kind":"pith_short_16","alias_value":"6PCK6DQSNCRXB2CY","created_at":"2026-05-18T12:33:10.108867+00:00"},{"alias_kind":"pith_short_8","alias_value":"6PCK6DQS","created_at":"2026-05-18T12:33:10.108867+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/6PCK6DQSNCRXB2CYLR4MZ6H52X","json":"https://pith.science/pith/6PCK6DQSNCRXB2CYLR4MZ6H52X.json","graph_json":"https://pith.science/api/pith-number/6PCK6DQSNCRXB2CYLR4MZ6H52X/graph.json","events_json":"https://pith.science/api/pith-number/6PCK6DQSNCRXB2CYLR4MZ6H52X/events.json","paper":"https://pith.science/paper/6PCK6DQS"},"agent_actions":{"view_html":"https://pith.science/pith/6PCK6DQSNCRXB2CYLR4MZ6H52X","download_json":"https://pith.science/pith/6PCK6DQSNCRXB2CYLR4MZ6H52X.json","view_paper":"https://pith.science/paper/6PCK6DQS","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1903.07690&json=true","fetch_graph":"https://pith.science/api/pith-number/6PCK6DQSNCRXB2CYLR4MZ6H52X/graph.json","fetch_events":"https://pith.science/api/pith-number/6PCK6DQSNCRXB2CYLR4MZ6H52X/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/6PCK6DQSNCRXB2CYLR4MZ6H52X/action/timestamp_anchor","attest_storage":"https://pith.science/pith/6PCK6DQSNCRXB2CYLR4MZ6H52X/action/storage_attestation","attest_author":"https://pith.science/pith/6PCK6DQSNCRXB2CYLR4MZ6H52X/action/author_attestation","sign_citation":"https://pith.science/pith/6PCK6DQSNCRXB2CYLR4MZ6H52X/action/citation_signature","submit_replication":"https://pith.science/pith/6PCK6DQSNCRXB2CYLR4MZ6H52X/action/replication_record"}},"created_at":"2026-05-17T23:41:42.668198+00:00","updated_at":"2026-05-17T23:41:42.668198+00:00"}