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

研究成果: Article査読

1 被引用数 (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).

ジャーナルSolid State Communications
出版ステータスPublished - 2015 2月

ASJC Scopus subject areas

  • 化学 (全般)
  • 凝縮系物理学
  • 材料化学


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