{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:E2VZDAYQT6TRKREI2OCH2GIJFW","short_pith_number":"pith:E2VZDAYQ","canonical_record":{"source":{"id":"2012.13399","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2020-12-24T18:59:34Z","cross_cats_sorted":["cond-mat.str-el"],"title_canon_sha256":"db2fba9ed3267829c96995694a3753231c45f476ab082f3f639d8470757e2f1f","abstract_canon_sha256":"817efed101ee1446760c80f667f9451af3742fd5074224e39cbe03c5813cc0c5"},"schema_version":"1.0"},"canonical_sha256":"26ab9183109fa7154488d3847d19092d99478f083027494a6a9404f9630a8351","source":{"kind":"arxiv","id":"2012.13399","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2012.13399","created_at":"2026-07-05T03:55:46Z"},{"alias_kind":"arxiv_version","alias_value":"2012.13399v2","created_at":"2026-07-05T03:55:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2012.13399","created_at":"2026-07-05T03:55:46Z"},{"alias_kind":"pith_short_12","alias_value":"E2VZDAYQT6TR","created_at":"2026-07-05T03:55:46Z"},{"alias_kind":"pith_short_16","alias_value":"E2VZDAYQT6TRKREI","created_at":"2026-07-05T03:55:46Z"},{"alias_kind":"pith_short_8","alias_value":"E2VZDAYQ","created_at":"2026-07-05T03:55:46Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:E2VZDAYQT6TRKREI2OCH2GIJFW","target":"record","payload":{"canonical_record":{"source":{"id":"2012.13399","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2020-12-24T18:59:34Z","cross_cats_sorted":["cond-mat.str-el"],"title_canon_sha256":"db2fba9ed3267829c96995694a3753231c45f476ab082f3f639d8470757e2f1f","abstract_canon_sha256":"817efed101ee1446760c80f667f9451af3742fd5074224e39cbe03c5813cc0c5"},"schema_version":"1.0"},"canonical_sha256":"26ab9183109fa7154488d3847d19092d99478f083027494a6a9404f9630a8351","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:55:46.870871Z","signature_b64":"ouFYGzsSRfgrpGdNewkGLrVQnGI42p21Nlu+dkHdRAy0qZmtIB2ifqxYoGG/CVk4t88cQ/mKVXSKZniUvELvCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"26ab9183109fa7154488d3847d19092d99478f083027494a6a9404f9630a8351","last_reissued_at":"2026-07-05T03:55:46.870451Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:55:46.870451Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2012.13399","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T03:55:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zw97pkLFriCyUF3IcYCxXwwa4gT0BemkACPUmN+uqd4lRXYlPX24kSLLEsTkip8zG/e8D/eC9NV2Zs5XWfM4CA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-14T14:53:09.997867Z"},"content_sha256":"83b28470c7f6add8583bd69f1b6276dd82ec79a5b8edcec06f5488d413243ed3","schema_version":"1.0","event_id":"sha256:83b28470c7f6add8583bd69f1b6276dd82ec79a5b8edcec06f5488d413243ed3"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:E2VZDAYQT6TRKREI2OCH2GIJFW","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Superconductivity induced by structural reorganization in the electron-doped cuprate Nd$_{2-x}$Ce$_x$CuO$_4$","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.str-el"],"primary_cat":"cond-mat.supr-con","authors_text":"Adolfo Avella, Angela Nigro, Anita Guarino, Antonio Leo, Carmine Autieri, Gaia Grimaldi, Pasquale Marra","submitted_at":"2020-12-24T18:59:34Z","abstract_excerpt":"Electron-doped and hole-doped superconducting cuprates exhibit a symmetric phase diagram as a function of doping. This symmetry is however only approximate. Indeed, electron-doped cuprates become superconductors only after a specific annealing process: This annealing affects the oxygen content by only a tiny amount, but has a dramatic impact on the electronic properties of the sample. Here we report the occurrence of superconductivity in oxygen-deficient Nd$_{2-x}$Ce$_x$CuO$_4$ thin films grown in an oxygen-free environment, after annealing in pure argon flow. As verified by x-ray diffraction,"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2012.13399","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2012.13399/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T03:55:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"tt3MM78eIgiVceeQgInxO9ntfRUiFFasOE7HovFlckEojLylu0/0w1HfcVMHo5ZspxOf2vrgX5+5JnwfVmn7Aw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-14T14:53:09.998344Z"},"content_sha256":"407ddfe930ce139c411a5494c475f7cc3d63a8eb2b75923712ecd32b8eae31b0","schema_version":"1.0","event_id":"sha256:407ddfe930ce139c411a5494c475f7cc3d63a8eb2b75923712ecd32b8eae31b0"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/E2VZDAYQT6TRKREI2OCH2GIJFW/bundle.json","state_url":"https://pith.science/pith/E2VZDAYQT6TRKREI2OCH2GIJFW/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/E2VZDAYQT6TRKREI2OCH2GIJFW/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":"2026-08-14T14:53:10Z","links":{"resolver":"https://pith.science/pith/E2VZDAYQT6TRKREI2OCH2GIJFW","bundle":"https://pith.science/pith/E2VZDAYQT6TRKREI2OCH2GIJFW/bundle.json","state":"https://pith.science/pith/E2VZDAYQT6TRKREI2OCH2GIJFW/state.json","well_known_bundle":"https://pith.science/.well-known/pith/E2VZDAYQT6TRKREI2OCH2GIJFW/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:E2VZDAYQT6TRKREI2OCH2GIJFW","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":"817efed101ee1446760c80f667f9451af3742fd5074224e39cbe03c5813cc0c5","cross_cats_sorted":["cond-mat.str-el"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2020-12-24T18:59:34Z","title_canon_sha256":"db2fba9ed3267829c96995694a3753231c45f476ab082f3f639d8470757e2f1f"},"schema_version":"1.0","source":{"id":"2012.13399","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2012.13399","created_at":"2026-07-05T03:55:46Z"},{"alias_kind":"arxiv_version","alias_value":"2012.13399v2","created_at":"2026-07-05T03:55:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2012.13399","created_at":"2026-07-05T03:55:46Z"},{"alias_kind":"pith_short_12","alias_value":"E2VZDAYQT6TR","created_at":"2026-07-05T03:55:46Z"},{"alias_kind":"pith_short_16","alias_value":"E2VZDAYQT6TRKREI","created_at":"2026-07-05T03:55:46Z"},{"alias_kind":"pith_short_8","alias_value":"E2VZDAYQ","created_at":"2026-07-05T03:55:46Z"}],"graph_snapshots":[{"event_id":"sha256:407ddfe930ce139c411a5494c475f7cc3d63a8eb2b75923712ecd32b8eae31b0","target":"graph","created_at":"2026-07-05T03:55:46Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2012.13399/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Electron-doped and hole-doped superconducting cuprates exhibit a symmetric phase diagram as a function of doping. This symmetry is however only approximate. Indeed, electron-doped cuprates become superconductors only after a specific annealing process: This annealing affects the oxygen content by only a tiny amount, but has a dramatic impact on the electronic properties of the sample. Here we report the occurrence of superconductivity in oxygen-deficient Nd$_{2-x}$Ce$_x$CuO$_4$ thin films grown in an oxygen-free environment, after annealing in pure argon flow. As verified by x-ray diffraction,","authors_text":"Adolfo Avella, Angela Nigro, Anita Guarino, Antonio Leo, Carmine Autieri, Gaia Grimaldi, Pasquale Marra","cross_cats":["cond-mat.str-el"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2020-12-24T18:59:34Z","title":"Superconductivity induced by structural reorganization in the electron-doped cuprate Nd$_{2-x}$Ce$_x$CuO$_4$"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2012.13399","kind":"arxiv","version":2},"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":"sha256:83b28470c7f6add8583bd69f1b6276dd82ec79a5b8edcec06f5488d413243ed3","target":"record","created_at":"2026-07-05T03:55:46Z","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":"817efed101ee1446760c80f667f9451af3742fd5074224e39cbe03c5813cc0c5","cross_cats_sorted":["cond-mat.str-el"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2020-12-24T18:59:34Z","title_canon_sha256":"db2fba9ed3267829c96995694a3753231c45f476ab082f3f639d8470757e2f1f"},"schema_version":"1.0","source":{"id":"2012.13399","kind":"arxiv","version":2}},"canonical_sha256":"26ab9183109fa7154488d3847d19092d99478f083027494a6a9404f9630a8351","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"26ab9183109fa7154488d3847d19092d99478f083027494a6a9404f9630a8351","first_computed_at":"2026-07-05T03:55:46.870451Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:55:46.870451Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ouFYGzsSRfgrpGdNewkGLrVQnGI42p21Nlu+dkHdRAy0qZmtIB2ifqxYoGG/CVk4t88cQ/mKVXSKZniUvELvCA==","signature_status":"signed_v1","signed_at":"2026-07-05T03:55:46.870871Z","signed_message":"canonical_sha256_bytes"},"source_id":"2012.13399","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:83b28470c7f6add8583bd69f1b6276dd82ec79a5b8edcec06f5488d413243ed3","sha256:407ddfe930ce139c411a5494c475f7cc3d63a8eb2b75923712ecd32b8eae31b0"],"state_sha256":"81c3e73c316599b66b4b4fd3e4e06311ac19d4cffebeed89d02722661aeea5b8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"hIR4E2MGUZe4sX0jd3qFsPMK+qzaHxg+eCXuUgIoqNtpHgyJssFeBVhNnAUc827FvHCHYdqIVo5HPAHoApf6Ag==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-14T14:53:10.003048Z","bundle_sha256":"2c73a23baae737055d0c4a837891ef08931eb159f0cd5aed408aaa71cbd7ff43"}}