STM/STS study of the superconducting gap in SmFeAsO1-xFx

Yuki Kawashima, Koichi Ichimura, Kazuhiro Katono, Tohru Kurosawa, Migaku Oda, Satoshi Tanda, Yoichi Kamihara, Hideo Hosono

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


We report an electron tunneling study of SmFeAsO1-xFx in the low doping region (x=0, 0.045, 0.046, 0.069) by low temperature UHV-STM/STS. Superconducting gaps are observed for each superconducting sample x=0.045 (Tc=12.9 K), x=0.046 (Tc=32.9 K) and x=0.069 (Tc=46.9 K). We obtained corresponding superconducting gap size of ΔSC=9.5±0.5meV, 9.75±0.25 meV and 11±1 meV. While Tc increases, ΔSC is kept the same. This suggests that the effective attractive interaction is the same and that there is some mechanism that suppresses the superconductivity in the low doping region. On the other hand, similar gap structures were found in a non-superconducting sample with x=0 at 7.8 K. The obtained gap size was ΔN=8.5±1.5meV, which is almost the same as the superconducting gap in the superconducting samples (x=0.045, 0.046, 0.069).

Original languageEnglish
Pages (from-to)33-36
Number of pages4
JournalSolid State Communications
Publication statusPublished - 2015 Feb


  • A. Iron-based superconductor
  • D. Superconducting gap
  • E. STM

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry


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