Determination of superconducting gap of SmFeAsFxO1-x superconductors by Andreev reflection spectroscopy

T. Y. Chen, S. X. Huang, Z. Tesanovic, R. H. Liu, X. H. Chen, C. L. Chien

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


The superconducting gap in FeAs-based superconductor SmFeAs(O1-xFx) (x = 0.15 and 0.30) and the temperature dependence of the sample with x = 0.15 have been measured by Andreev reflection spectroscopy. The intrinsic superconducting gap is independent of contacts while many other "gap-like" features vary appreciably for different contacts. The determined gap value of 2Δ = 13.34 ± 0.47 meV for SmFeAs(O0.85F0.15) gives 2Δ/kBTC = 3.68, close to the BCS prediction of 3.53. The superconducting gap decreases with temperature and vanishes at TC, in a manner similar to the BCS behavior but dramatically different from that of the nodal pseudogap behavior in cuprate superconductors.

Original languageEnglish (US)
Pages (from-to)521-528
Number of pages8
JournalPhysica C: Superconductivity and its applications
Issue number9-12
StatePublished - 2009
Externally publishedYes


  • Andreev reflection spectroscopy
  • Fe-superconductors
  • Point contact
  • Superconducting gap

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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