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As $n$ increases, the phase transition from a topological insulator to a band insulator is found to occur between $n=2$ and 3 for both series. Significantly, among the new topological insulators, we found a bulk band gap of 0.40eV in PbBi$_2$Se$_4$ which is one of the largest gap topological insulators, and that Pb$_2$Sb$_2$Te$_5$ is located in the immediate vicinity of the topological phase boundary, making"},"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":"1007.5480","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2010-07-30T15:50:05Z","cross_cats_sorted":[],"title_canon_sha256":"7786dc44a96dba117cdcfc0fee68f668029c1f71c41397d890570984075323ff","abstract_canon_sha256":"34544fdf6abc9fe998f899a36778e77e480f3e44e812ce6dc9008f3c9ef8dbe5"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:06:00.849755Z","signature_b64":"jmqxpTiQ6bMp+D1pH7Jd6oPTaPb7Y0h1AyKMjP0kLdnHQH9icM9tKTbiCv15nscyVN9jjG3eQ2ekMCQOIA0ECQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"35aea86af3e448cb575ffcd7ed35b0ce62ce95f5a577caedb2b3be71b5525cd3","last_reissued_at":"2026-05-18T02:06:00.849123Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:06:00.849123Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"New Candidates for Topological Insulators : Pb-based chalcogenide series","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Arthur J. 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