{"paper":{"title":"Nematic fluctuations and the magneto-structural phase transition in ${\\rm Ba(Fe_{1-x}Co_x)_2As_2}$","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.str-el","authors_text":"Andreas Baum, Bernhard Muschler, Carlo Di Castro, Daniel Jost, Florian Kretzschmar, Ian Randal Fisher, James G. Analytis, Jiun-Haw Chu, Joerg Schmalian, Marco Grilli, Rudi Hackl, Sergio Caprara, Thomas B\\\"ohm, Una Karahasanovi\\'c","submitted_at":"2015-07-22T09:53:44Z","abstract_excerpt":"An inelastic light (Raman) scattering study of nematicity and critical fluctuations in ${\\rm Ba(Fe_{1-x}Co_x)_2As_2}$ ($0\\le x \\le 0.051$) is presented. It is shown that the response from fluctuations appears only in $B_{1g}$ (${x^2-y^2}$) symmetry. The scattering amplitude increases towards the structural transition at $T_s$ but vanishes only below the magnetic ordering transition at $T_{\\rm SDW} < T_s$, suggesting a magnetic origin of the fluctuations. The theoretical analysis explains the selection rules and the temperature dependence of the fluctuation response. These results make magnetis"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1507.06116","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}