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arxiv: 1702.03774 · v2 · pith:NZOXR2RWnew · submitted 2017-02-13 · ❄️ cond-mat.str-el · cond-mat.mtrl-sci· cond-mat.supr-con

Nematic Fluctuations and Phase Transitions in LaFeAsO: a Raman Scattering Study

U. F. Kaneko , P. F. Gomes , A. F. Garcia-Flores , J. Q. Yan , T. A. Lograsso , G. E. Barberis , D. Vaknin , E. Granado This is my paper
classification ❄️ cond-mat.str-el cond-mat.mtrl-scicond-mat.supr-con
keywords fluctuationslafeasonematicramanscatteringtransitionsantiferromagneticarea
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Raman scattering experiments on LaFeAsO with splitted antiferromagnetic (T_AFM = 140 K) and tetragonal-orthorhombic (T_S = 155 K) transitions show a quasi-elastic peak (QEP) in B2g symmetry (2 Fe tetragonal cell) that fades away below ~T_AFM and is ascribed to electronic nematic fluctuations. A scaling of the reported shear modulus with the T-dependence of the QEP height rather than the QEP area indicates that magnetic degrees of freedom drive the structural transition. The large separation between T_S and T_AFM in LaFeAsO compared with their coincidence in BaFe2As2 manifests itself in slower dynamics of nematic fluctuations in the former.

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