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

doi:10.1143/JPSJ.77.063708

Superconducting gap and pseudogap in iron-based layered superconductor La(O_1-xF_x)FeAs

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

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111 Citations (Scopus)

Abstract

We report high-resolution photoemission spectroscopy of newly-discovered iron-based layered superconductor La(O_0.93F_0.07)FeAs (T_c = 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 T_c, which is gradually filled-in with increasing temperature and closes at temperature far above T_c similarly to copper-oxide high-temperature superconductors.

Original language	English
Article number	063708
Journal	Journal of the Physical Society of Japan
Volume	77
Issue number	6
DOIs	https://doi.org/10.1143/JPSJ.77.063708
Publication status	Published - 2008 Jun

Keywords

Iron-based superconductor
Photoemission spectroscopy
Pseudogap
Superconducting gap

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10.1143/JPSJ.77.063708

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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.",

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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

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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.

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Superconducting gap and pseudogap in iron-based layered superconductor La(O_1-xF_x)FeAs

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