Superconducting gap and pseudogap in iron-based layered superconductor La(O1-xFx)FeAs

Takafumi Sato, Seigo Souma, Kosuke Nakayama, Kensei Terashima, Katsuaki Sugawara, Takashi Takahashi, Yoichi Kamihara, Masahiro Hirano, Hideo Hosono

Research output: Contribution to journalArticle

101 Citations (Scopus)

Abstract

We report high-resolution photoemission spectroscopy of newly-discovered iron-based layered superconductor La(O0.93F0.07)FeAs (Tc = 24 K). We found that the superconducting gap shows a marked deviation from the isotropic s-wave symmetry. The estimated gap size at 5K is 3.6 meV in the s- or axial p-wave case, while it is 4.1 meV in the polar p- or d-wave case. We also found a pseudogap of 15-20 meV above Tc, which is gradually filled-in with increasing temperature and closes at temperature far above Tc similarly to copper-oxide high-temperature superconductors.

Original languageEnglish
Article number063708
JournalJournal of the Physical Society of Japan
Volume77
Issue number6
DOIs
Publication statusPublished - 2008 Jun
Externally publishedYes

Fingerprint

iron
copper oxides
high temperature superconductors
photoelectric emission
deviation
temperature
high resolution
symmetry
spectroscopy

Keywords

  • Iron-based superconductor
  • Photoemission spectroscopy
  • Pseudogap
  • Superconducting gap

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Sato, T., Souma, S., Nakayama, K., Terashima, K., Sugawara, K., Takahashi, T., ... Hosono, H. (2008). Superconducting gap and pseudogap in iron-based layered superconductor La(O1-xFx)FeAs. Journal of the Physical Society of Japan, 77(6), [063708]. https://doi.org/10.1143/JPSJ.77.063708

Superconducting gap and pseudogap in iron-based layered superconductor La(O1-xFx)FeAs. / Sato, Takafumi; Souma, Seigo; Nakayama, Kosuke; Terashima, Kensei; Sugawara, Katsuaki; Takahashi, Takashi; Kamihara, Yoichi; Hirano, Masahiro; Hosono, Hideo.

In: Journal of the Physical Society of Japan, Vol. 77, No. 6, 063708, 06.2008.

Research output: Contribution to journalArticle

Sato, T, Souma, S, Nakayama, K, Terashima, K, Sugawara, K, Takahashi, T, Kamihara, Y, Hirano, M & Hosono, H 2008, 'Superconducting gap and pseudogap in iron-based layered superconductor La(O1-xFx)FeAs', Journal of the Physical Society of Japan, vol. 77, no. 6, 063708. https://doi.org/10.1143/JPSJ.77.063708
Sato, Takafumi ; Souma, Seigo ; Nakayama, Kosuke ; Terashima, Kensei ; Sugawara, Katsuaki ; Takahashi, Takashi ; Kamihara, Yoichi ; Hirano, Masahiro ; Hosono, Hideo. / Superconducting gap and pseudogap in iron-based layered superconductor La(O1-xFx)FeAs. In: Journal of the Physical Society of Japan. 2008 ; Vol. 77, No. 6.
@article{8297595d620b40c2be642117ef48f973,
title = "Superconducting gap and pseudogap in iron-based layered superconductor La(O1-xFx)FeAs",
abstract = "We report high-resolution photoemission spectroscopy of newly-discovered iron-based layered superconductor La(O0.93F0.07)FeAs (Tc = 24 K). We found that the superconducting gap shows a marked deviation from the isotropic s-wave symmetry. The estimated gap size at 5K is 3.6 meV in the s- or axial p-wave case, while it is 4.1 meV in the polar p- or d-wave case. We also found a pseudogap of 15-20 meV above Tc, which is gradually filled-in with increasing temperature and closes at temperature far above Tc similarly to copper-oxide high-temperature superconductors.",
keywords = "Iron-based superconductor, Photoemission spectroscopy, Pseudogap, Superconducting gap",
author = "Takafumi Sato and Seigo Souma and Kosuke Nakayama and Kensei Terashima and Katsuaki Sugawara and Takashi Takahashi and Yoichi Kamihara and Masahiro Hirano and Hideo Hosono",
year = "2008",
month = "6",
doi = "10.1143/JPSJ.77.063708",
language = "English",
volume = "77",
journal = "Journal of the Physical Society of Japan",
issn = "0031-9015",
publisher = "Physical Society of Japan",
number = "6",

}

TY - JOUR

T1 - Superconducting gap and pseudogap in iron-based layered superconductor La(O1-xFx)FeAs

AU - Sato, Takafumi

AU - Souma, Seigo

AU - Nakayama, Kosuke

AU - Terashima, Kensei

AU - Sugawara, Katsuaki

AU - Takahashi, Takashi

AU - Kamihara, Yoichi

AU - Hirano, Masahiro

AU - Hosono, Hideo

PY - 2008/6

Y1 - 2008/6

N2 - We report high-resolution photoemission spectroscopy of newly-discovered iron-based layered superconductor La(O0.93F0.07)FeAs (Tc = 24 K). We found that the superconducting gap shows a marked deviation from the isotropic s-wave symmetry. The estimated gap size at 5K is 3.6 meV in the s- or axial p-wave case, while it is 4.1 meV in the polar p- or d-wave case. We also found a pseudogap of 15-20 meV above Tc, which is gradually filled-in with increasing temperature and closes at temperature far above Tc similarly to copper-oxide high-temperature superconductors.

AB - We report high-resolution photoemission spectroscopy of newly-discovered iron-based layered superconductor La(O0.93F0.07)FeAs (Tc = 24 K). We found that the superconducting gap shows a marked deviation from the isotropic s-wave symmetry. The estimated gap size at 5K is 3.6 meV in the s- or axial p-wave case, while it is 4.1 meV in the polar p- or d-wave case. We also found a pseudogap of 15-20 meV above Tc, which is gradually filled-in with increasing temperature and closes at temperature far above Tc similarly to copper-oxide high-temperature superconductors.

KW - Iron-based superconductor

KW - Photoemission spectroscopy

KW - Pseudogap

KW - Superconducting gap

UR - http://www.scopus.com/inward/record.url?scp=54349103979&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=54349103979&partnerID=8YFLogxK

U2 - 10.1143/JPSJ.77.063708

DO - 10.1143/JPSJ.77.063708

M3 - Article

AN - SCOPUS:54349103979

VL - 77

JO - Journal of the Physical Society of Japan

JF - Journal of the Physical Society of Japan

SN - 0031-9015

IS - 6

M1 - 063708

ER -