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 journalArticle

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
Publication statusPublished - 2008
Externally publishedYes

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space transportation system
electron tunneling
superconductivity
anomalies
curves

Keywords

  • LaOFFeAs
  • Pseudogap
  • STM/STS
  • Superconducting gap

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Ichimura, K., Ishioka, J., Kurosawa, T., Inagaki, K., Oda, M., Tanda, S., ... Hosono, H. (2008). Superconducting gap and pseudogap structure in LaFeAsO1-xF x probed by STM/STS. Journal of the Physical Society of Japan, 77(SUPPL. C), 151-152.

Superconducting gap and pseudogap structure in LaFeAsO1-xF x probed by STM/STS. / Ichimura, Koichi; Ishioka, Junya; Kurosawa, Toru; Inagaki, Katsuhiko; Oda, Migaku; Tanda, Satoshi; Takahashi, Hiroki; Okada, Hironari; Kamihara, Yoichi; Hirano, Masahiro; Hosono, Hideo.

In: Journal of the Physical Society of Japan, Vol. 77, No. SUPPL. C, 2008, p. 151-152.

Research output: Contribution to journalArticle

Ichimura, K, Ishioka, J, Kurosawa, T, Inagaki, K, Oda, M, Tanda, S, Takahashi, H, Okada, H, Kamihara, Y, Hirano, M & Hosono, H 2008, 'Superconducting gap and pseudogap structure in LaFeAsO1-xF x probed by STM/STS', Journal of the Physical Society of Japan, vol. 77, no. SUPPL. C, pp. 151-152.
Ichimura K, Ishioka J, Kurosawa T, Inagaki K, Oda M, Tanda S et al. Superconducting gap and pseudogap structure in LaFeAsO1-xF x probed by STM/STS. Journal of the Physical Society of Japan. 2008;77(SUPPL. C):151-152.
Ichimura, Koichi ; Ishioka, Junya ; Kurosawa, Toru ; Inagaki, Katsuhiko ; Oda, Migaku ; Tanda, Satoshi ; Takahashi, Hiroki ; Okada, Hironari ; Kamihara, Yoichi ; Hirano, Masahiro ; Hosono, Hideo. / Superconducting gap and pseudogap structure in LaFeAsO1-xF x probed by STM/STS. In: Journal of the Physical Society of Japan. 2008 ; Vol. 77, No. SUPPL. C. pp. 151-152.
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