{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"48464e0a7a771a6bf80cfd7b98bb3106fba196d4b4b10afba164f3642c03cdd3","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["14bc878649b69b8875db62824c319078a4d970be2cdb7b3112ce2367d6696176","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"d513c3fbaf9419e097bb64a22f036e8e9ab64e437b2c7adcb21f78682ba360de","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"classification","assisted_by":[],"external_id":"cm.iron-based.nematic-driving-force","kind":"phenomenon","literature_status":"contested","n":"2","parents":[],"plain":"Electrons in iron-based materials spontaneously choose one crystal direction; it is debated whether magnetism, orbital occupation, or chemical bonds drive this choice, especially in FeSe where no magnetism follows.","posed_since":"","precise":"In iron pnictides and FeSe, determine whether $B1g$ electronic nematic order (measured by elastoresistance and Raman) is driven by spin fluctuations (vestigial order of stripe magnetism), by orbital order ($n_{xz} - n_{yz}$), or by bond order, and in particular explain nematic order at $T_s \\sim 90\\,\\mathrm{K}$ without magnetic order in FeSe. An answer is a theory consistent with the neutron spin-fluctuation spectrum, the ARPES orbital splitting and the absence of magnetic order in FeSe.","problem_ref":"14bc878649b69b8875db62824c319078a4d970be2cdb7b3112ce2367d6696176","references":"","settled_by":"A calculation reproducing $T_s$, the orbital splitting and the spin-fluctuation spectrum of FeSe and $\\mathrm{BaFe_2As_2}$ with one set of interaction parameters.","status_note":"","title":"What drives electronic nematic order in iron-based superconductors?","topic_ref":null},"content_withheld":"false","files":[],"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"76fe11f76020c236a58357691b0891ad6625981c391c0109625fb2fd7e6678d8","schema":"pubphys.attested/1"},"id_token":null,"id_token_withheld":"false","envelope":{"attested_hash":"a221e166fcf73004964baa503fa36e1ebd32976897146898aef869deaf88aeea","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"vaTAr1zy6FdsahaLEMAsCAS_tjtmHLFsmMc3pp8d7dxpG0aMTaAqphiWR-GEsOmn2vtb_cZvI026XFfIwTcCCQ"},"schema":"pubphys.envelope/1"},"ots":{"attested":["AE9wZW5UaW1lc3RhbXBzAABQcm9vZgC_ieLohOiSlAEIoiHhZvz3MASWS6pQP6NuHr0yl2iXFGiYrvhp3q-IrurxIKIX5bRRah3aZLuwNHXIX2cH06brI3bYsnsumTd9YdvlCPEgAqMsuwORc2EaVQIC3nKSMqeEH-DrKgU9sDqRuPhdbyII8SAjhU0Fmt3FgM97INasaK43-mxC5pXQivEIL65M2qxrrwjwIF18V4HybSIHGXpzJQB5t7onGBtfmRU9MGvFrw-wFpdQCPAgngEmag311smr2dbbz5RyFsX3um9RORbZSQ2o7adqXukI8SBAqVCSFCm1UPt3tzJq7L_e5yR40AN11e6hlhcf6rxxkgjxIDBAU6f3ks_jdJWq01nJ53RbZ-GR4QT8S6jCBNB5gwmWCPAgUHOv0mBDZ9d-BqWpjMVqJtWnXrhO30mHNHFZD6dhSq0I8CDKr-9A1x_uMQhhNTqvWvXpPsAsdseP-4IejtAraE3u4AjwIIgwugvlgSNOmTWMhquqetKjeLf0x7d1a1MH4KU52JbFCPAg3mczMYDKOd7Nhf3ojA9ZvuTsN66Y1NnyYTp9j8GKQNwI8SCvAiiN-Hrv7IEejd8wdUihoozu5KOvpoBFJ0vg3UnGAQj_8Ajn9YmozHwo9QjwEJ46aM9ZDv3TdtqV3ZbRsNgI8SBOF8pILGf1kodr5MKmQs6Cd93joraGn3g6UPt_-kewPwjwIOG-gmM7bd_eR4AiDMNfluS3xvr7vicLR-sCBr5qtG2cCPAgrVNFrCoeQcCxhlmnE0BzHgR8HQpZAlfqzDDFzfWb8GUI8QRq0WWT8AjZJ2cF_c7k8ACD3-MNLvkMjiwraHR0cHM6Ly9ib2IuYnRjLmNhbGVuZGFyLm9wZW50aW1lc3RhbXBzLm9yZ_AI9ZMS1zxd7IEI8BDd00WgJZ0RncsC1Fyai_4aCPEgvxMFrnu7F05IW5INiraQ3OVEYMjNx6JfBxw1Q4jPLi4I8QRq0WWS8Ag2zxPAtI5JsP8Ag9_jDS75DI4uLWh0dHBzOi8vYWxpY2UuYnRjLmNhbGVuZGFyLm9wZW50aW1lc3RhbXBzLm9yZwjxIHAnv4KFFf4uiYEFJvLxiMxSyz8VowJP4roTfDD9h7bICPAgj5tgvbNF7mxSP4jGGE66ezUFRLnI4g1VTkvuV4VtCPAI8CCxlc1HuKORuHgn7DYIYcDhc4oo99OkTWBEvddBypoa7AjwIFcjjaF8kDNDYCZGaNISlRjvX-I7in-QNwsr4JYQbFJvCPAgnl0k4gs7LuY5i1umiHO-J7My3uBThLJUWQoY9LdVSrQI8SA6-Ft11_K_GqMNWYhkVsVqCFvXSYbp4S8JoLsLBnUzvgjxIBC8_mAE7JBP35SNxDBcG7joLJwURpMxdV2vSO64_jEOCPEge04Coj1xSi7CE8UwqiBGNhPyZ5QdD_YZwn-heSdObU4I8SBgdDSgr3VUx1j8m_pK7-OzMwwFgXeLy43ujffCv-hf5AjwIMl-PnAt4xjoBEVU4-nkyN0NKRa9AvX4kEMfllFyIJS9CPFZAQAAAAHz4rV-uwQFg02bVnEMUFgpIdGKjM4tWuID1kTVnrjisAAAAAAA_v___wJURAIAAAAAABYAFBFys2oc0-U-bYrC3VulGLzND5fbAAAAAAAAAAAiaiDwBHLTDgAICPEgMJIBYi46xOIuFDwzJ9nOx14ngW5HbglUf65ORpkoIYcICPAgHgGWEGCDHWgscwT92NOoJ7s-ezbPkyiWr2RnYZDC_dwICPAgtffMyyLu-MscJsDc0dzwGspwSrrmvVAnMNgsgWhHClgICPAgMUl1OfBDUwhp5VZjHwVA0nuz1F5HZTUJCHAnM1L1F3MICPAgStK7UWpnrUueV5EaE7uE0y6BLMp6EANmrbhrTqEBZu8ICPAg5LVW7IHtUL5mNOvPx1hOTfLMmqlQ7t9EFW-KDtrISIQICPAgABgXZ6upFU8qiDQKFtQFpqkjKwl0PsxM4JUjVLlDKbkICPAgEwb96FiOhjlbwI8GFZQ4a5GXwxs4bUdqVOMKrtBWV30ICPEgqBg-wp0c8CAPV9k6J7wIa9_GtQfpWmhpE1zqFZyi2pQICPAg2pZLTVPGJbriiz0UhMytYDVYAXOgQnWDcrMOewK9O8cICPEgxm3QwzbvT4siJzubQGnST67bWv-exYwSPP1KDi7CaUwICPEgm6udUudfjUaM0gUFTylKGDMypj7ptMTG0zmxd_T5yTcICPAgMpOInkjFCVp1pOZhfZnyPAl8hdWGmHzQcrGLgLwSKLgICAAFiJYNc9cZAQPzpjs"],"envelope":["AE9wZW5UaW1lc3RhbXBzAABQcm9vZgC_ieLohOiSlAEI1dgvXUt3CbDcYOkbgJR-6LapSe8yBYnpcu2Ob3vVWqnxINV5aLodmU5L18LnISHtnHRWRrZBh41GpTlwQUrxTqipCPEg6Z5pL3l9mv2wQgYx8Qe_v2gRUOLW4-Yb5td1Pwe-V5YI8CBoKi4esV-t3ZDaYQPhGnKoLDFivEWe7b1Bsz6_GOJabQjxINQJiFlW8fwjL-HVhSVD_GmfnYkEYfkoVWEI0GTETpxZCPAgTbWcC5Ae-Spaekd2rvDgiIr1SkxQq_b_jlFhG4ZrlK4I8SBOah5ypxtRtDOu-dr3uJcT-L4zLqWa8rKnJ2VczYahogjxII-HQyDbfySaSfEBkdNEhf9eJgFGPux1xPs8ZdzzMWpACPEgA7tb_tb_4KngwMf2GSJCpmxJdfmzdO37wjFC3fvNh0wI8CCSqAf0sn_1-kk9EDPXEZvjRff_ciLViVfMVybjDX1OsQjxID89HsXrUag9eRv04qSQX18D2ak5pxDN4H8m3_0Qkp84CPAg3mczMYDKOd7Nhf3ojA9ZvuTsN66Y1NnyYTp9j8GKQNwI8SCvAiiN-Hrv7IEejd8wdUihoozu5KOvpoBFJ0vg3UnGAQj_8Ajn9YmozHwo9QjwEJ46aM9ZDv3TdtqV3ZbRsNgI8SBOF8pILGf1kodr5MKmQs6Cd93joraGn3g6UPt_-kewPwjwIOG-gmM7bd_eR4AiDMNfluS3xvr7vicLR-sCBr5qtG2cCPAgrVNFrCoeQcCxhlmnE0BzHgR8HQpZAlfqzDDFzfWb8GUI8QRq0WWT8AjZJ2cF_c7k8ACD3-MNLvkMjiwraHR0cHM6Ly9ib2IuYnRjLmNhbGVuZGFyLm9wZW50aW1lc3RhbXBzLm9yZ_AI9ZMS1zxd7IEI8BDd00WgJZ0RncsC1Fyai_4aCPEgvxMFrnu7F05IW5INiraQ3OVEYMjNx6JfBxw1Q4jPLi4I8QRq0WWS8Ag2zxPAtI5JsP8Ag9_jDS75DI4uLWh0dHBzOi8vYWxpY2UuYnRjLmNhbGVuZGFyLm9wZW50aW1lc3RhbXBzLm9yZwjxIHAnv4KFFf4uiYEFJvLxiMxSyz8VowJP4roTfDD9h7bICPAgj5tgvbNF7mxSP4jGGE66ezUFRLnI4g1VTkvuV4VtCPAI8CCxlc1HuKORuHgn7DYIYcDhc4oo99OkTWBEvddBypoa7AjwIFcjjaF8kDNDYCZGaNISlRjvX-I7in-QNwsr4JYQbFJvCPAgnl0k4gs7LuY5i1umiHO-J7My3uBThLJUWQoY9LdVSrQI8SA6-Ft11_K_GqMNWYhkVsVqCFvXSYbp4S8JoLsLBnUzvgjxIBC8_mAE7JBP35SNxDBcG7joLJwURpMxdV2vSO64_jEOCPEge04Coj1xSi7CE8UwqiBGNhPyZ5QdD_YZwn-heSdObU4I8SBgdDSgr3VUx1j8m_pK7-OzMwwFgXeLy43ujffCv-hf5AjwIMl-PnAt4xjoBEVU4-nkyN0NKRa9AvX4kEMfllFyIJS9CPFZAQAAAAHz4rV-uwQFg02bVnEMUFgpIdGKjM4tWuID1kTVnrjisAAAAAAA_v___wJURAIAAAAAABYAFBFys2oc0-U-bYrC3VulGLzND5fbAAAAAAAAAAAiaiDwBHLTDgAICPEgMJIBYi46xOIuFDwzJ9nOx14ngW5HbglUf65ORpkoIYcICPAgHgGWEGCDHWgscwT92NOoJ7s-ezbPkyiWr2RnYZDC_dwICPAgtffMyyLu-MscJsDc0dzwGspwSrrmvVAnMNgsgWhHClgICPAgMUl1OfBDUwhp5VZjHwVA0nuz1F5HZTUJCHAnM1L1F3MICPAgStK7UWpnrUueV5EaE7uE0y6BLMp6EANmrbhrTqEBZu8ICPAg5LVW7IHtUL5mNOvPx1hOTfLMmqlQ7t9EFW-KDtrISIQICPAgABgXZ6upFU8qiDQKFtQFpqkjKwl0PsxM4JUjVLlDKbkICPAgEwb96FiOhjlbwI8GFZQ4a5GXwxs4bUdqVOMKrtBWV30ICPEgqBg-wp0c8CAPV9k6J7wIa9_GtQfpWmhpE1zqFZyi2pQICPAg2pZLTVPGJbriiz0UhMytYDVYAXOgQnWDcrMOewK9O8cICPEgxm3QwzbvT4siJzubQGnST67bWv-exYwSPP1KDi7CaUwICPEgm6udUudfjUaM0gUFTylKGDMypj7ptMTG0zmxd_T5yTcICPAgMpOInkjFCVp1pOZhfZnyPAl8hdWGmHzQcrGLgLwSKLgICAAFiJYNc9cZAQPzpjs"]},"log":{"leaf_index":"2880","tree_size":"3804","proof":["738bf81cbcd79fcb15c7b9be4ad44fdf9d10bfd23fbd4305106938e28d9291f4","344266cab9ae86078b29406f4431cf92b94178f85ebd4ba78d854288ba7f4faa","4d2839fd5dbc7aea7563eb94930c09e0031dbaedf028f959dc9d5c722b783fbf","d7c253754a922deafd0170dd31c04b32d860b84a80859dcd0d362f494c97f170","209a3291d152feee35a9e3dff8221373353cbeb15f4aaa94e238e7fa3e92718f","d836c20458e4e5686828b505d297904a86856bdd281add62f017480bc28541ca","6984ff284df9cd05f5fc874363b51edd45630415b9fc04bbb281f18b0be18a5a","35943d50e127dd46c0e87af4e164fc8e3c68cc080e1e586a454baa6a53014e7a","56960156727d0f461a1b3857ab83f18526eaef848c820c927094afc1f989d56c","b0b232078d071c92816af6274529aef23a2ea1f41246694fec32d768cfa09dc8","325287f5a43e4f3ad4072ec4bd53d43c50c1393021a056122e9cb0fad83b868f","3c578dccc15502c5f3efe228cadc99fee76ab536ed01f66b14d316fdcc157429"],"checkpoint":"pubphys.com/log/v1\n3804\nAK6t4qgu96+M9wScTrIlsJ10d/zhKVEtYguyM3aeJvo=\n\n— pubphys.com/log/v1 JFPwIPP8EtoxgcsQg7V7CwIdL4UKPqJtpv+eB8sFNJjyQHIdyA1VabmBsPyLqq2bLxJPn57rA6fQi8y0QDDjRXHvlQg=\n","promise":"pubphys.com/log/v1 promise\n2bb6e07d7a8b78da2959e1ba379ea4b69aa6cbfde0706a183fb6e287c5ae01a1\n2880\n2026-10-15T23:43:57Z\n2026-10-16T01:43:57Z\n\n— pubphys.com/log/v1 JFPwIJA6VkobNvuR1wbsFtPlaqEZUMe4z4U3HHo1ZOl0+ZYkLqq5FtH3ooHmVTxBMlUi8VaBZ2aUucfl3qrKjy+OtQU=\n"},"orcid_key_evidence":[],"attesting":null}