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These peaks reveal strong c-axis correlations involving the CuO_2 bilayers, show a non-uniform increase below \\~220 K with a plateau for ~100-160 K, and appear to saturate in the superconducting phase. We interpret this unconventional T-dependence of the ``oxygen-ordering'' peaks as a manifestation of a charge density wave in the CuO_2 planes coupled to the oxygen-vacancy ordering."},"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/0110390","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"cond-mat.supr-con","submitted_at":"2001-10-18T23:20:07Z","cross_cats_sorted":[],"title_canon_sha256":"baa0075f3d6d9f46db098a5023ef9e56f8e6fef974b089656ebe3f8c721e5063","abstract_canon_sha256":"a2357773b31214441b21580d483e551df798d7e69f13ab8d364848441e8a87a3"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:24:39.827912Z","signature_b64":"ZEEw0Bn+s8gsCfGr7PJJkZ4Cy9u40WG6IK8qHAm25ondj9x0BBBbR3/HSzbjWRiKv52HmSGyS105tif/48lNAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"618ab37e29d00a3a1cf837588a9c511ae7c4f9ee9ba5a2897f2ac2c10f36bd07","last_reissued_at":"2026-05-18T03:24:39.827412Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:24:39.827412Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"X-Ray-Diffraction Study of Charge-Density-Waves and Oxygen-Ordering in YBa2Cu3O6+x Superconductor","license":"","headline":"","cross_cats":[],"primary_cat":"cond-mat.supr-con","authors_text":"B. 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