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Surprisingly, the collapsed tetragonal phase hosts a superconducting state with $T_c \\sim 12~\\mathrm{K}$, while the tetragonal phase is a $T_c \\leq 3.4~\\mathrm{K}$ superconductor. We show that the key difference between the previously known non-superconducting collapsed tetragonal phase in AFe$_2$As$_2$ (A= Ba, Ca, Eu, Sr) and the superconducting collapsed tetragonal phase in KFe$_2$As$_2$ is the qualitatively distinct e"},"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":"1501.03068","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2015-01-13T16:44:53Z","cross_cats_sorted":["cond-mat.str-el"],"title_canon_sha256":"50bef814d7b17e843a865627786202434c9d38cce74cc8af47d84762419fe648","abstract_canon_sha256":"f70bc8d0f4b901a02a1fa230c337ffba02f5c3a08b287b28dad33a238a507c26"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:19:00.489689Z","signature_b64":"a2/9vo2Z7KrblPdSQOGT7RLde23a7/CCwRezDB4dyNbaatVoO8L46/L8Zsp8p4jrY3nOtFt5pfbMDmffgGX5DQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4616ec5071074946f5cfebf175eb99d172686fe912cf9c0c0ba88435146d70a1","last_reissued_at":"2026-05-18T02:19:00.489236Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:19:00.489236Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Origin of the superconducting state in the collapsed tetragonal phase of KFe2As2","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.str-el"],"primary_cat":"cond-mat.supr-con","authors_text":"Daniel Guterding, Harald O. 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