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

doi:10.1016/j.ssc.2014.12.003

STM/STS study of the superconducting gap in SmFeAsO_1-xF_x

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

Department of Applied Physics and Physico-Informatics

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

We report an electron tunneling study of SmFeAsO_1-xF_x 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 (T_c=12.9 K), x=0.046 (T_c=32.9 K) and x=0.069 (T_c=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 T_c 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 language	English
Pages (from-to)	33-36
Number of pages	4
Journal	Solid State Communications
Volume	204
DOIs	https://doi.org/10.1016/j.ssc.2014.12.003
Publication status	Published - 2015 Feb

Keywords

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

ASJC Scopus subject areas

Chemistry(all)
Condensed Matter Physics
Materials Chemistry

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10.1016/j.ssc.2014.12.003

Cite this

@article{4ae75fc2ec784824b4e4daa4eb4962f5,

title = "STM/STS study of the superconducting gap in SmFeAsO1-xFx",

abstract = "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).",

keywords = "A. Iron-based superconductor, D. Superconducting gap, E. STM",

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

note = "Funding Information: This work was supported by the 21COE program on “Topological Science and Technology” of the Ministry of Education, Culture, Sport, Science and Technology of Japan. This work was partially supported by the Asahi Glass Foundation, and the Japan Society for Promotion of Science (JSPS) KAKENHI Grant no. 26400337 . Publisher Copyright: {\textcopyright} 2014 Published by Elsevier Ltd.",

year = "2015",

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doi = "10.1016/j.ssc.2014.12.003",

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T1 - STM/STS study of the superconducting gap in SmFeAsO1-xFx

AU - Kawashima, Yuki

AU - Ichimura, Koichi

AU - Katono, Kazuhiro

AU - Kurosawa, Tohru

AU - Oda, Migaku

AU - Tanda, Satoshi

AU - Kamihara, Yoichi

AU - Hosono, Hideo

N1 - Funding Information: This work was supported by the 21COE program on “Topological Science and Technology” of the Ministry of Education, Culture, Sport, Science and Technology of Japan. This work was partially supported by the Asahi Glass Foundation, and the Japan Society for Promotion of Science (JSPS) KAKENHI Grant no. 26400337 . Publisher Copyright: © 2014 Published by Elsevier Ltd.

PY - 2015/2

Y1 - 2015/2

N2 - 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).

AB - 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).

KW - A. Iron-based superconductor

KW - D. Superconducting gap

KW - E. STM

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