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

See allHide authors and affiliations

Science Advances  16 Oct 2015:
Vol. 1, no. 9, e1500206
DOI: 10.1126/sciadv.1500206


The emergence of nematic electronic states accompanied by a structural phase transition is a recurring theme in many correlated electron materials, including the high-temperature copper oxide– and iron-based superconductors. We provide evidence for nematic electronic states in the iron-chalcogenide superconductor FeSe0.4Te0.6 from quasi-particle scattering detected in spectroscopic maps. The symmetry-breaking states persist above Tc into the normal state. We interpret the scattering patterns by comparison with quasi-particle interference patterns obtained from a tight-binding model, accounting for orbital ordering. The relation to superconductivity and the influence on the coherence length are discussed.

  • iron-based superconductors
  • scanning tunneling microscopy and spectroscopy
  • nematicity
  • symmetry breaking
  • Superconductivity
  • quasi-particle interference

This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license, which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.

View Full Text

Stay Connected to Science Advances