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On the other hand, for small alkali metals, studies on (Li,Na)FeCu(S,Se)2 and NaFe2-{\\delta}S2 shows that these compounds possess CaAl2Si2-type structure, implying that ThCr2Si2-type structure is unstable for small alkali-metal intercalated FeSe under high-temperature. Here we report a new intercalate Na0.65(1)Fe1.93(1)Se2 with Tc ~ 37 K, synthesized by low-temperature ammono"},"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":"1410.6385","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2014-10-23T15:00:46Z","cross_cats_sorted":["cond-mat.mtrl-sci","cond-mat.str-el"],"title_canon_sha256":"3167194fa4f37859b2dcab8afa87d7b83ca7944cd7a4276346b94e06ae030311","abstract_canon_sha256":"cb0056a2be28a7c4003a0c04ddedca94efeae94a56ea111b90d5ac0119a4d427"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:39:31.019285Z","signature_b64":"d9WeC9CqnwAQkibDqEb5rx0sX4Ot7R/ADkSLYps9mDhQQU9m05wbL7G+YhBIzSHAjzOmJ4tHTz65fNoqonpMDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f5a8dc3059aa751ce99f4847bf05649dfabe1ededc34defbe8b65f389647d558","last_reissued_at":"2026-05-18T02:39:31.018704Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:39:31.018704Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Superconductivity and phase instability of NH3-free Na-intercalated FeSe1-zSz","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.mtrl-sci","cond-mat.str-el"],"primary_cat":"cond-mat.supr-con","authors_text":"Fumitaka Hayashi, Hechang Lei, Hideo Hosono, Jiangang Guo","submitted_at":"2014-10-23T15:00:46Z","abstract_excerpt":"The discovery of ThCr2Si2-type AxFe2-ySe2 (A = K, Rb, Cs and Tl) with Tc ~ 30K make much progress in iron-based superconducting field, but their multiple-phase separations are disadvantageous for understanding the origin. On the other hand, for small alkali metals, studies on (Li,Na)FeCu(S,Se)2 and NaFe2-{\\delta}S2 shows that these compounds possess CaAl2Si2-type structure, implying that ThCr2Si2-type structure is unstable for small alkali-metal intercalated FeSe under high-temperature. 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