Superconducting gap and pseudogap structure in LaFeAsO1-xF x probed by STM/STS

Koichi Ichimura, Junya Ishioka, Toru Kurosawa, Katsuhiko Inagaki, Migaku Oda, Satoshi Tanda, Hiroki Takahashi, Hironari Okada, Yoichi Kamihara, Masahiro Hirano, Hideo Hosono

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

We report the electron tunneling study on LaFeAsO1-xF x (x=0.07) using low temperature UHV-STM/STS. Tunneling spectra below Tc clearly shows the gap structure. We found three anomalies as kinks in the tunneling differential conductance curve: 1) Superconducting gap structure ΔSC=6 meV. 2) Small pseudogap ΔPGS= 20 meV. 3) Large pseudogap ΔPGL=100-150 meV. Corresponding value of 2ΔSC/kBTc=5.8 suggests strong coupling superconductivity. Tunneling spectra at T=80 K show dip structure. The kink around V=150 mV still exist.

Original languageEnglish
Pages (from-to)151-152
Number of pages2
JournalJournal of the Physical Society of Japan
Volume77
Issue numberSUPPL. C
DOIs
Publication statusPublished - 2008
Externally publishedYes

Keywords

  • LaOFFeAs
  • Pseudogap
  • STM/STS
  • Superconducting gap

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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