Evidence for orbital order and its relation to superconductivity in FeSe0.4Te0.6

Udai Raj Singh, Seth C. White, Stefan Schmaus, Vladimir Tsurkan, Alois Loidl, Joachim Deisenhofer, Peter Wahl

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22 Citations (Scopus)
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The emergence of nematic electronic states which break the symmetry of the underlying lattice is a recurring theme in many correlated electron materials, among them the high temperature copper-oxide and iron-based superconductors. Here we provide evidence for the existence of nematic electronic states in the iron chalcogenide superconductor FeSe0.4Te0.6. The symmetry breaking states persist above TC into the normal state. We find an anisotropic coherence length, which is suppressed in a direction perpendicular to the nematic modulations. We interpret the scattering patterns by comparison with quasiparticle interference patterns obtained within a tight-binding model, accounting for orbital ordering.

Original languageEnglish
Article numbere1500206
JournalScience Advances
Issue number9
Publication statusPublished - 16 Oct 2015


  • Iron-based superconductors
  • Scanning tunneling microscopy and spectroscopy
  • Nematicity
  • Symmetry breaking
  • Superconductivity
  • Quasi-particle interference


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