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For BaFe2As2 and 57Fe to 54$Fe substitution we find a c-axis expansion of 1 10^{-3}{\\AA} and in-plane a-axis contraction of 1 10^{-5}{\\AA} at 250K in good agreement with experimental values on (Ba,K)Fe2As2 for which a negative isotope exponent \\alpha=-\\frac{d\\ln T_c}{d\\ln m}<0 was found [P.M. Shirage et al., Phys. Rev. Lett. 103, 257003 (2009)]. For FeSe in contrast we find an expansio"},"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":"1106.5332","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2011-06-27T09:02:58Z","cross_cats_sorted":["cond-mat.str-el"],"title_canon_sha256":"d5482be6d989f08191f7f3113186a6860bc7a2b127759c038fc48469c5a72c81","abstract_canon_sha256":"7bc92c840cb446bb0a92f824de9331be4d54905a701638cb7a05975562d9da5b"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:12:10.186430Z","signature_b64":"PAgtz+/9oWlQEGUYO5KOAdkr0raSthiTMlQN+ykbxDM8I4k79AeT0R/tvwVplyEdZ5QMUllCB4JhnwRAg4QECg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6a1c0674dd9ebe7db2b062edeaa7655dba61d94ce601a233a698792965e2ef20","last_reissued_at":"2026-05-18T04:12:10.185460Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:12:10.185460Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Lattice expansion from isotope substitution in the Iron based superconductors","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.str-el"],"primary_cat":"cond-mat.supr-con","authors_text":"Mats Granath, Oleg Kim","submitted_at":"2011-06-27T09:02:58Z","abstract_excerpt":"We estimate the changes in lattice parameters due to iron isotope substitution in the iron-based high temperature superconductors using a variational calculation based on the anharmonicity of the Fe-As(Se) bond. 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