{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2008:7UAO2PWWJF4DRZ2E5WJ4TRA72U","short_pith_number":"pith:7UAO2PWW","schema_version":"1.0","canonical_sha256":"fd00ed3ed6497838e744ed93c9c41fd501e2b5d903d46610a4fa574686870ded","source":{"kind":"arxiv","id":"0805.4463","version":1},"attestation_state":"computed","paper":{"title":"Superconductivity in undoped T' cuprates with Tc over 30 K","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.supr-con","authors_text":"Akio Tsukada, Aya Utsuki, Hideki Yamamoto, Michio Naito, Osamu Matsumoto, Takaaki Manabe","submitted_at":"2008-05-29T03:13:13Z","abstract_excerpt":"Undoped cuprates have long been considered to be antiferromagnetic insulators. In this article, however, we report that superconductivity is achieved in undoped T'-RE2CuO4 (RE = Pr, Nd, Sm, Eu, and Gd). Our discovery was performed by using metal-organic decomposition (MOD), an inexpensive and easy-to-implement thin-film process. The keys to prepare the superconducting films are firing with low partial-pressure of oxygen and reduction at low temperatures. The highest Tc of undoped T'-RE2CuO4 is over 30 K, substantially higher than \"electron-doped\" analogs. Remarkably, Gd2CuO4, even the derivati"},"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":"0805.4463","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2008-05-29T03:13:13Z","cross_cats_sorted":[],"title_canon_sha256":"c2a818895e0ba7168a99174da9db0f2a44463d1ceb2fef6f8ef936e74cbd2855","abstract_canon_sha256":"90b26ceb42852c4a749abb457004a8fb7778b136816c355007d4c885f2db6c54"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:24:18.584652Z","signature_b64":"4fFj0PmG7VJLfWtaYKIiF+UReFBjFGjHVpepyvp3E6YeqcBMnSvSzTxrqq0IBsl10rpeJZ3qab6snEdbSqTRCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"fd00ed3ed6497838e744ed93c9c41fd501e2b5d903d46610a4fa574686870ded","last_reissued_at":"2026-05-18T03:24:18.583787Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:24:18.583787Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Superconductivity in undoped T' cuprates with Tc over 30 K","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.supr-con","authors_text":"Akio Tsukada, Aya Utsuki, Hideki Yamamoto, Michio Naito, Osamu Matsumoto, Takaaki Manabe","submitted_at":"2008-05-29T03:13:13Z","abstract_excerpt":"Undoped cuprates have long been considered to be antiferromagnetic insulators. In this article, however, we report that superconductivity is achieved in undoped T'-RE2CuO4 (RE = Pr, Nd, Sm, Eu, and Gd). Our discovery was performed by using metal-organic decomposition (MOD), an inexpensive and easy-to-implement thin-film process. The keys to prepare the superconducting films are firing with low partial-pressure of oxygen and reduction at low temperatures. The highest Tc of undoped T'-RE2CuO4 is over 30 K, substantially higher than \"electron-doped\" analogs. Remarkably, Gd2CuO4, even the derivati"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0805.4463","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":"0805.4463","created_at":"2026-05-18T03:24:18.583931+00:00"},{"alias_kind":"arxiv_version","alias_value":"0805.4463v1","created_at":"2026-05-18T03:24:18.583931+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0805.4463","created_at":"2026-05-18T03:24:18.583931+00:00"},{"alias_kind":"pith_short_12","alias_value":"7UAO2PWWJF4D","created_at":"2026-05-18T12:25:56.245647+00:00"},{"alias_kind":"pith_short_16","alias_value":"7UAO2PWWJF4DRZ2E","created_at":"2026-05-18T12:25:56.245647+00:00"},{"alias_kind":"pith_short_8","alias_value":"7UAO2PWW","created_at":"2026-05-18T12:25:56.245647+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/7UAO2PWWJF4DRZ2E5WJ4TRA72U","json":"https://pith.science/pith/7UAO2PWWJF4DRZ2E5WJ4TRA72U.json","graph_json":"https://pith.science/api/pith-number/7UAO2PWWJF4DRZ2E5WJ4TRA72U/graph.json","events_json":"https://pith.science/api/pith-number/7UAO2PWWJF4DRZ2E5WJ4TRA72U/events.json","paper":"https://pith.science/paper/7UAO2PWW"},"agent_actions":{"view_html":"https://pith.science/pith/7UAO2PWWJF4DRZ2E5WJ4TRA72U","download_json":"https://pith.science/pith/7UAO2PWWJF4DRZ2E5WJ4TRA72U.json","view_paper":"https://pith.science/paper/7UAO2PWW","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=0805.4463&json=true","fetch_graph":"https://pith.science/api/pith-number/7UAO2PWWJF4DRZ2E5WJ4TRA72U/graph.json","fetch_events":"https://pith.science/api/pith-number/7UAO2PWWJF4DRZ2E5WJ4TRA72U/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/7UAO2PWWJF4DRZ2E5WJ4TRA72U/action/timestamp_anchor","attest_storage":"https://pith.science/pith/7UAO2PWWJF4DRZ2E5WJ4TRA72U/action/storage_attestation","attest_author":"https://pith.science/pith/7UAO2PWWJF4DRZ2E5WJ4TRA72U/action/author_attestation","sign_citation":"https://pith.science/pith/7UAO2PWWJF4DRZ2E5WJ4TRA72U/action/citation_signature","submit_replication":"https://pith.science/pith/7UAO2PWWJF4DRZ2E5WJ4TRA72U/action/replication_record"}},"created_at":"2026-05-18T03:24:18.583931+00:00","updated_at":"2026-05-18T03:24:18.583931+00:00"}