{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2004:ZA33NK2CRQLTFQA4TAL6IHCLOI","short_pith_number":"pith:ZA33NK2C","schema_version":"1.0","canonical_sha256":"c837b6ab428c1732c01c9817e41c4b72370c3bfe6206f4f29af2812b566e20f1","source":{"kind":"arxiv","id":"cond-mat/0402484","version":1},"attestation_state":"computed","paper":{"title":"Oxidation State of Cobalt in the NaxCoO2-d yH2O Superconductor","license":"","headline":"","cross_cats":["cond-mat.str-el"],"primary_cat":"cond-mat.supr-con","authors_text":"Hisao Yamauchi, Isao Asako, Maarit Karppinen, Teruki Motohashi","submitted_at":"2004-02-18T23:53:51Z","abstract_excerpt":"Here we present results of accurate wet-chemical redox analyses, revealing that the oxidation number of cobalt in the newly discovered CoO2-layer superconductor, NaxCoO2 yH2O (x ~ 0.36, y ~ 1.3) is ~ 3.46. This value is significantly lower than the one (~ 3.64) expected on the basis of the value determined for the Na to Co stoichiometry ratio, x. The \"lower-than-expected\" value for the Co oxidation state may be alternatively explained by presence of oxygen vacancies or excess protons. Moreover, the result implies that rather than an electron-doped Co(IV) lattice the phase should be considered "},"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":"cond-mat/0402484","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"cond-mat.supr-con","submitted_at":"2004-02-18T23:53:51Z","cross_cats_sorted":["cond-mat.str-el"],"title_canon_sha256":"3995a778e5911142bb5d04f887019859de91fa7ecf60f918d86d85406de37c8b","abstract_canon_sha256":"1ecd4d6ade27a1039f1d54dead89caa06250887e2472d3e21c8f7be2f88ac088"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T14:48:29.926270Z","signature_b64":"84L/BWSUluz7D92i/k4IaRrz5z99KE8kpN/AzemX/9Y7tl7t69+xIhbscsZPwMsYpc8YpyN7o4eMo+V3PAMHAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c837b6ab428c1732c01c9817e41c4b72370c3bfe6206f4f29af2812b566e20f1","last_reissued_at":"2026-07-04T14:48:29.925871Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T14:48:29.925871Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Oxidation State of Cobalt in the NaxCoO2-d yH2O Superconductor","license":"","headline":"","cross_cats":["cond-mat.str-el"],"primary_cat":"cond-mat.supr-con","authors_text":"Hisao Yamauchi, Isao Asako, Maarit Karppinen, Teruki Motohashi","submitted_at":"2004-02-18T23:53:51Z","abstract_excerpt":"Here we present results of accurate wet-chemical redox analyses, revealing that the oxidation number of cobalt in the newly discovered CoO2-layer superconductor, NaxCoO2 yH2O (x ~ 0.36, y ~ 1.3) is ~ 3.46. This value is significantly lower than the one (~ 3.64) expected on the basis of the value determined for the Na to Co stoichiometry ratio, x. The \"lower-than-expected\" value for the Co oxidation state may be alternatively explained by presence of oxygen vacancies or excess protons. Moreover, the result implies that rather than an electron-doped Co(IV) lattice the phase should be considered "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"cond-mat/0402484","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/cond-mat/0402484/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"},"aliases":[{"alias_kind":"arxiv","alias_value":"cond-mat/0402484","created_at":"2026-07-04T14:48:29.925938+00:00"},{"alias_kind":"arxiv_version","alias_value":"cond-mat/0402484v1","created_at":"2026-07-04T14:48:29.925938+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.cond-mat/0402484","created_at":"2026-07-04T14:48:29.925938+00:00"},{"alias_kind":"pith_short_12","alias_value":"ZA33NK2CRQLT","created_at":"2026-07-04T14:48:29.925938+00:00"},{"alias_kind":"pith_short_16","alias_value":"ZA33NK2CRQLTFQA4","created_at":"2026-07-04T14:48:29.925938+00:00"},{"alias_kind":"pith_short_8","alias_value":"ZA33NK2C","created_at":"2026-07-04T14:48:29.925938+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/ZA33NK2CRQLTFQA4TAL6IHCLOI","json":"https://pith.science/pith/ZA33NK2CRQLTFQA4TAL6IHCLOI.json","graph_json":"https://pith.science/api/pith-number/ZA33NK2CRQLTFQA4TAL6IHCLOI/graph.json","events_json":"https://pith.science/api/pith-number/ZA33NK2CRQLTFQA4TAL6IHCLOI/events.json","paper":"https://pith.science/paper/ZA33NK2C"},"agent_actions":{"view_html":"https://pith.science/pith/ZA33NK2CRQLTFQA4TAL6IHCLOI","download_json":"https://pith.science/pith/ZA33NK2CRQLTFQA4TAL6IHCLOI.json","view_paper":"https://pith.science/paper/ZA33NK2C","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=cond-mat/0402484&json=true","fetch_graph":"https://pith.science/api/pith-number/ZA33NK2CRQLTFQA4TAL6IHCLOI/graph.json","fetch_events":"https://pith.science/api/pith-number/ZA33NK2CRQLTFQA4TAL6IHCLOI/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/ZA33NK2CRQLTFQA4TAL6IHCLOI/action/timestamp_anchor","attest_storage":"https://pith.science/pith/ZA33NK2CRQLTFQA4TAL6IHCLOI/action/storage_attestation","attest_author":"https://pith.science/pith/ZA33NK2CRQLTFQA4TAL6IHCLOI/action/author_attestation","sign_citation":"https://pith.science/pith/ZA33NK2CRQLTFQA4TAL6IHCLOI/action/citation_signature","submit_replication":"https://pith.science/pith/ZA33NK2CRQLTFQA4TAL6IHCLOI/action/replication_record"}},"created_at":"2026-07-04T14:48:29.925938+00:00","updated_at":"2026-07-04T14:48:29.925938+00:00"}