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Room temperature local nematicity in FeSe superconductor

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arxiv 1902.08732 v2 pith:OPMLX3D5 submitted 2019-02-23 cond-mat.supr-con cond-mat.mtrl-sci

Room temperature local nematicity in FeSe superconductor

R. J. Koch , T. Konstantinova , M. Abeykoon , A. Wang , C. Petrovic , Y. Zhu , E. S. Bozin , S. J. L. Billinge This is my paper
classification cond-mat.supr-con cond-mat.mtrl-sci
keywords distortionfeselocalanalysisaveragenematicobservedorthorhombic
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We report pair distribution function measurements of the iron-based superconductor FeSe above and below the structural transition temperature. Structural analysis reveals a local orthorhombic distortion with a correlation length of about 4 nm at temperatures where an average tetragonal symmetry is observed. The analysis further demonstrates that the local distortion is larger than the distortion at temperatures where the average observed symmetry is orthorhombic. Our results suggest that the low-temperature macroscopic nematic state in FeSe forms from an imperfect ordering of orbital-degeneracy-lifted nematic fluctuations which persist up to at least 300 K.

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