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

doi:10.1103/PhysRevB.100.020501

Room temperature local nematicity in FeSe superconductor

Superconductivity 2019-07-10 v2 Materials Science

Authors: R. J. Koch , T. Konstantinova , M. Abeykoon , A. Wang , C. Petrovic , Y. Zhu , E. S. Bozin , S. J. L. Billinge

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Abstract

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.

Keywords

iron-based superconductor fese nematicity pair distribution function orthorhombic distortion structural transition

Cite

@article{arxiv.1902.08732,
  title  = {Room temperature local nematicity in FeSe superconductor},
  author = {R. J. Koch and T. Konstantinova and M. Abeykoon and A. Wang and C. Petrovic and Y. Zhu and E. S. Bozin and S. J. L. Billinge},
  journal= {arXiv preprint arXiv:1902.08732},
  year   = {2019}
}

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6 pages, 4 figures

Room temperature local nematicity in FeSe superconductor

Abstract

Keywords

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