Charge-induced nematicity in FeSe

Pierre Massat, Donato Farina, Indranil Paul, Sandra Karlsson, Pierre Strobel, Pierre Toulemonde, Marie Aude Méasson, Maximilien Cazayous, Alain Sacuto, Shigeru Kasahara, Takasada Shibauchi, Yuji Matsuda, Yann Gallais

Research output: Contribution to journalArticlepeer-review

82 Citations (Scopus)


The spontaneous appearance of nematicity, a state of matter that breaks rotation but not translation symmetry, is one of the most intriguing properties of the iron-based superconductors (Fe SC), and has relevance for the cuprates as well. Establishing the critical electronic modes behind nematicity remains a challenge, however, because their associated susceptibilities are not easily accessible by conventional probes. Here, using FeSe as a model system, and symmetry-resolved electronic Raman scattering as a probe, we unravel the presence of critical charge nematic fluctuations near the structural/nematic transition temperature, TS ∼ 90 K. The diverging behavior of the associated nematic susceptibility foretells the presence of a Pomeranchuk instability of the Fermi surface with d-wave symmetry. The excellent scaling between the observed nematic susceptibility and elastic modulus data demonstrates that the structural distortion is driven by this d-wave Pomeranchuk transition. Our results make a strong case for chargeinduced nematicity in FeSe.

Original languageEnglish
Pages (from-to)9177-9181
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number33
Publication statusPublished - Aug 16 2016
Externally publishedYes


  • Nematicity
  • Raman scattering
  • Superconductivity

ASJC Scopus subject areas

  • General


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