{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2019:PDIYYMIE5DEHFTP3MJZYBVUPM6","short_pith_number":"pith:PDIYYMIE","schema_version":"1.0","canonical_sha256":"78d18c3104e8c872cdfb627380d68f67849ebcafb6a430b5d75bf3420fd40807","source":{"kind":"arxiv","id":"1907.06510","version":1},"attestation_state":"computed","paper":{"title":"Iodide-methylammonium interaction is responsible for ferroelectricity in CH3NH3PbI3","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Frederike Lehmann, Harriott Nowell, Joachim Breternitz, Sarah A. Barnett, Susan Schorr","submitted_at":"2019-07-15T13:58:06Z","abstract_excerpt":"Excellent conversion efficiencies of over 20 % and facile cell production have placed hybrid perovskites at the forefront of novel solar cell materials with CH3NH3PbI3 being its archetypal compound. The question why CH3NH3PbI3 has such extraordinary characteristics, particularly a hugely efficient light absorption, is hotly debated with ferroelectricity being a promising candidate. This does, however, afford the crystal structure to be non-centrosymmetric and we herein present crystallographic evidence as to how the symmetry breaking occurs on a crystallographic, and therefore long-scale, leve"},"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":"1907.06510","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2019-07-15T13:58:06Z","cross_cats_sorted":[],"title_canon_sha256":"bede4db882c0b2f5f005022eb10ad713e9bdadd1472e0589c80981e2f3606cb7","abstract_canon_sha256":"2437710a038776be4667d897db94edaad9d544c457ef8a7e2016a8b4d10a5384"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:40:37.533527Z","signature_b64":"YBPgzqsnlH+gT7rChsnpVll2wJGKEIZKrwOtPD/TNxjVmhdZnC6qkx95+76VGjff4ALWYpm84WvoUmxwqqrPCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"78d18c3104e8c872cdfb627380d68f67849ebcafb6a430b5d75bf3420fd40807","last_reissued_at":"2026-05-17T23:40:37.533075Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:40:37.533075Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Iodide-methylammonium interaction is responsible for ferroelectricity in CH3NH3PbI3","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Frederike Lehmann, Harriott Nowell, Joachim Breternitz, Sarah A. Barnett, Susan Schorr","submitted_at":"2019-07-15T13:58:06Z","abstract_excerpt":"Excellent conversion efficiencies of over 20 % and facile cell production have placed hybrid perovskites at the forefront of novel solar cell materials with CH3NH3PbI3 being its archetypal compound. The question why CH3NH3PbI3 has such extraordinary characteristics, particularly a hugely efficient light absorption, is hotly debated with ferroelectricity being a promising candidate. This does, however, afford the crystal structure to be non-centrosymmetric and we herein present crystallographic evidence as to how the symmetry breaking occurs on a crystallographic, and therefore long-scale, leve"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1907.06510","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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1907.06510","created_at":"2026-05-17T23:40:37.533135+00:00"},{"alias_kind":"arxiv_version","alias_value":"1907.06510v1","created_at":"2026-05-17T23:40:37.533135+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1907.06510","created_at":"2026-05-17T23:40:37.533135+00:00"},{"alias_kind":"pith_short_12","alias_value":"PDIYYMIE5DEH","created_at":"2026-05-18T12:33:24.271573+00:00"},{"alias_kind":"pith_short_16","alias_value":"PDIYYMIE5DEHFTP3","created_at":"2026-05-18T12:33:24.271573+00:00"},{"alias_kind":"pith_short_8","alias_value":"PDIYYMIE","created_at":"2026-05-18T12:33:24.271573+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/PDIYYMIE5DEHFTP3MJZYBVUPM6","json":"https://pith.science/pith/PDIYYMIE5DEHFTP3MJZYBVUPM6.json","graph_json":"https://pith.science/api/pith-number/PDIYYMIE5DEHFTP3MJZYBVUPM6/graph.json","events_json":"https://pith.science/api/pith-number/PDIYYMIE5DEHFTP3MJZYBVUPM6/events.json","paper":"https://pith.science/paper/PDIYYMIE"},"agent_actions":{"view_html":"https://pith.science/pith/PDIYYMIE5DEHFTP3MJZYBVUPM6","download_json":"https://pith.science/pith/PDIYYMIE5DEHFTP3MJZYBVUPM6.json","view_paper":"https://pith.science/paper/PDIYYMIE","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1907.06510&json=true","fetch_graph":"https://pith.science/api/pith-number/PDIYYMIE5DEHFTP3MJZYBVUPM6/graph.json","fetch_events":"https://pith.science/api/pith-number/PDIYYMIE5DEHFTP3MJZYBVUPM6/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/PDIYYMIE5DEHFTP3MJZYBVUPM6/action/timestamp_anchor","attest_storage":"https://pith.science/pith/PDIYYMIE5DEHFTP3MJZYBVUPM6/action/storage_attestation","attest_author":"https://pith.science/pith/PDIYYMIE5DEHFTP3MJZYBVUPM6/action/author_attestation","sign_citation":"https://pith.science/pith/PDIYYMIE5DEHFTP3MJZYBVUPM6/action/citation_signature","submit_replication":"https://pith.science/pith/PDIYYMIE5DEHFTP3MJZYBVUPM6/action/replication_record"}},"created_at":"2026-05-17T23:40:37.533135+00:00","updated_at":"2026-05-17T23:40:37.533135+00:00"}