Spatial inhomogeneity of the superconducting gap and order parameter in Se0.4Te0.6

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

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30 Citations (Scopus)


We have performed a low-temperature scanning tunneling microscopy and spectroscopy study of the iron chalcogenide superconductor FeSe0.4Te0.6 with TC≈14 K. Spatially resolved measurements of the superconducting gap reveal substantial inhomogeneity on a nanometer length scale. Analysis of the structure of the gap seen in tunneling spectra by comparison with calculated spectra for different superconducting order parameters (s-wave, d-wave, and anisotropic s-wave) yields the best agreement for an order parameter with anisotropic s-wave symmetry with an anisotropy of ∼40%. The temperature dependence of the superconducting gap observed in places with large and small gap size indicates that it is indeed the superconducting transition temperature which is inhomogeneous. The temperature dependence of the gap size has been found to differ from the one predicted by BCS theory. An analysis of the local gap size in relation to the local chemical composition shows almost no correlation with the local concentration of Se/Te atoms at the surface.
Original languageEnglish
Article number155124
Number of pages5
JournalPhysical Review. B, Condensed matter and materials physics
Issue number15
Early online date21 Oct 2013
Publication statusPublished - Oct 2013


  • Iron-based superconductors
  • Scanning tunneling microscopy
  • Scanning tunneling spectroscopy


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