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We extend this superoxygenation concept of synthesis to thin films which, due to their large surface-to-volume ratio, are more reactive thermodynamically. Epitaxial thin films of $\\rm{YBa_2Cu_3O_{7-\\delta}}$ grown by pulsed laser deposition are annealed at up to 700 atm O$_2$ and 900$^\\circ$C, in conjunction with Cu enrichment by solid-state diffusion. The films show clear formation of $\\rm{Y_2Ba_4Cu_7O_{15-\\delta}}$ and $\\rm{Y_2Ba_4Cu_8O_{16}}$ as well"},"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":"1710.10672","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2017-10-29T18:58:17Z","cross_cats_sorted":[],"title_canon_sha256":"939eb60b838beb1ef1c5d073631c4b57633f696840014c640d8052bc7513e031","abstract_canon_sha256":"782b14df06fe6561f5b02ab6341910237494f3410e6b55cd738e9a154c75b207"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:19:25.831455Z","signature_b64":"uo8G+fQE4LS1KypKF4cHj5nOO3aGaP22RJKA9QIX+eUE7xSbIbwEAIIelS1nkhUXlJcl7WV7wQ+75zPsEl4JBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"94fe483623630d024f5e8b504128bf6d9374649bfd31941567b062ef648ca870","last_reissued_at":"2026-05-18T00:19:25.830954Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:19:25.830954Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Synthesis of high-oxidation Y-Ba-Cu-O phases in superoxygenated thin films","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.supr-con","authors_text":"C. 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