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The study of the material dependence of the d-wave superconducting gap (SG) should provide important insights into the mechanism of high-Tc. However, because of the 'pseudogap' phenomenon, it is often unclear whether the energy gaps observed by spectroscopic techniques really represent the SG. Here, we report spectroscopic imaging scanning tunneling microscopy (SI-STM) studies of nearly-optimally-doped Ca2-xNaxCuO2Cl2 (Na-CCOC) with Tc = 25 ~ 28 K"},"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":"0708.3728","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"cond-mat.supr-con","submitted_at":"2007-08-28T07:58:41Z","cross_cats_sorted":["cond-mat.str-el"],"title_canon_sha256":"f1c5c070cbd2b20c55f4398c8ad7c27968ec1299b255b1ba4904691d22e065b8","abstract_canon_sha256":"3e3cefd50393740cca731e9f9d39d57e08155d73ddf4d4753eb1a4f26076b3aa"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:16:21.991267Z","signature_b64":"GWGJcJQ1zL+OW73LjSi5/6IpmBvSNsH9noIRCQK/bYaD+FJkw48BaiUFLENZ/mdL7TuAxKPQ0DTMXzauK+PXBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5ffb566b6297830f1c014f3e88b972e924b1d9b0d19d80664b81e1122dbe363c","last_reissued_at":"2026-05-18T02:16:21.990605Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:16:21.990605Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Quasi-particle interference and superconducting gap in a high-temperature superconductor Ca2-xNaxCuO2Cl2","license":"","headline":"","cross_cats":["cond-mat.str-el"],"primary_cat":"cond-mat.supr-con","authors_text":"C. 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