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We find that in the system Zr$_4$Rh$_2$O$_{x}$, already a small amount ($x$ $\\geq$ 0.4) of oxygen addition stabilizes the $\\eta$-carbide structure over the more common intermetallic CuAl$_2$ structure-type, in which Zr$_2$Rh crystallizes. We show that Zr$_4$Rh$_2$O$_{0.7}$ and Zr$_4$Rh$_2$O are bulk superconductors with critical temperatures of $T_c \\ap"},"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":"1905.07402","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2019-05-17T11:48:26Z","cross_cats_sorted":[],"title_canon_sha256":"364e68c9ceb1a4f479d841c21ca85976ea7a0def88fa11fe0ea395d09c88596d","abstract_canon_sha256":"197a156ab4a7de715c1ff6145a824645faa47d8f985f151228a1665b98310658"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:45:51.399250Z","signature_b64":"9zifCOJkAR9CCwdU1CSSTqbkbTg39ITqyhzxEveAn9p6uYcu+lfUXZ9Wb2B1XUOTVkWTxiDLCdu6MUEzkthlAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"da92b84b43331b380b9c9b4ed4a3d5833daf6440b86ad642ae612a9fbc31e84c","last_reissued_at":"2026-05-17T23:45:51.398689Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:45:51.398689Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Superconductivity in the $\\eta$-carbide-type oxides Zr4Rh2Ox","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.supr-con","authors_text":"Fabian O. von Rohr, Jorge Lago, Keyuan Ma","submitted_at":"2019-05-17T11:48:26Z","abstract_excerpt":"We report on the synthesis and the superconductivity of Zr$_4$Rh$_2$O$_{x}$ ($x$ = 0.4, 0.5, 0.6, 0.7, 1.0). These compounds crystallize in the $\\eta$-carbide structure, which is a filled version of the complex intermetallic Ti$_2$Ni structure. We find that in the system Zr$_4$Rh$_2$O$_{x}$, already a small amount ($x$ $\\geq$ 0.4) of oxygen addition stabilizes the $\\eta$-carbide structure over the more common intermetallic CuAl$_2$ structure-type, in which Zr$_2$Rh crystallizes. 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