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

doi:10.1143/JPSJS.77SC.151

Superconducting gap and pseudogap structure in LaFeAsO_1-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 journal › Article › peer-review

5 Citations (Scopus)

Abstract

We report the electron tunneling study on LaFeAsO_1-xF _x (x=0.07) using low temperature UHV-STM/STS. Tunneling spectra below T_c clearly shows the gap structure. We found three anomalies as kinks in the tunneling differential conductance curve: 1) Superconducting gap structure Δ_SC=6 meV. 2) Small pseudogap Δ_PGS= 20 meV. 3) Large pseudogap Δ_PGL=100-150 meV. Corresponding value of 2Δ_SC/k_BT_c=5.8 suggests strong coupling superconductivity. Tunneling spectra at T=80 K show dip structure. The kink around V=150 mV still exist.

Original language	English
Pages (from-to)	151-152
Number of pages	2
Journal	Journal of the Physical Society of Japan
Volume	77
Issue number	SUPPL. C
DOIs	https://doi.org/10.1143/JPSJS.77SC.151
Publication status	Published - 2008
Externally published	Yes

Keywords

LaOFFeAs
Pseudogap
STM/STS
Superconducting gap

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1143/JPSJS.77SC.151

Cite this

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title = "Superconducting gap and pseudogap structure in LaFeAsO1-xF x probed by STM/STS",

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.",

keywords = "LaOFFeAs, Pseudogap, STM/STS, Superconducting gap",

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

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language = "English",

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TY - JOUR

T1 - Superconducting gap and pseudogap structure in LaFeAsO1-xF x probed by STM/STS

AU - Ichimura, Koichi

AU - Ishioka, Junya

AU - Kurosawa, Toru

AU - Inagaki, Katsuhiko

AU - Oda, Migaku

AU - Tanda, Satoshi

AU - Takahashi, Hiroki

AU - Okada, Hironari

AU - Kamihara, Yoichi

AU - Hirano, Masahiro

AU - Hosono, Hideo

PY - 2008

Y1 - 2008

N2 - 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.

AB - 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.

KW - LaOFFeAs

KW - Pseudogap

KW - STM/STS

KW - Superconducting gap

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