Electronic structure of the iron-based superconductor (La,Eu)FeAsO1-xFx investigated by laser photoemission spectroscopy

Walid Malaeb; Ramadan Awad; Taku Hibino; Yoichi Kamihara; Takeshi Kondo; Shik Shin

doi:10.1016/j.physb.2017.10.049

Electronic structure of the iron-based superconductor (La,Eu)FeAsO_1-xF_x investigated by laser photoemission spectroscopy

Walid Malaeb, Ramadan Awad, Taku Hibino, Yoichi Kamihara, Takeshi Kondo, Shik Shin

Department of Applied Physics and Physico-Informatics

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

1 Citation (Scopus)

Abstract

We have implemented laser photoemission spectroscopy (PES) to investigate the electronic structure of the iron-based superconductor (La,Eu)FeAsO_1-xF_x (LaEu1111) which is an interesting compound in the “1111” family showing a high value of the superconducting (SC) transition temperature (T_c) due to Eu doping. At least two energy scales were observed from the PES data in the SC compound: One at ∼14 meV closing around T_c and thus corresponding to the SC gap. Another energy scale appears at ∼35 meV and survives at temperatures above T_c which represents the pseudogap (PG). The non-SC sample (La,Eu)FeAsO shows a PG at ∼ 41 meV. These observations in this new superconductor are consistent with the general trend followed by other compounds in the “1111” family.

Original language	English
Pages (from-to)	781-784
Number of pages	4
Journal	Physica B: Condensed Matter
Volume	536
DOIs	https://doi.org/10.1016/j.physb.2017.10.049
Publication status	Published - 2018 May 1

Keywords

Eu doping
Iron-based superconductors
Laser photoemission spectroscopy
Pseudogap
Superconducting gap
“1111” compounds

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

Access to Document

10.1016/j.physb.2017.10.049

Cite this

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title = "Electronic structure of the iron-based superconductor (La,Eu)FeAsO1-xFx investigated by laser photoemission spectroscopy",

abstract = "We have implemented laser photoemission spectroscopy (PES) to investigate the electronic structure of the iron-based superconductor (La,Eu)FeAsO1-xFx (LaEu1111) which is an interesting compound in the “1111” family showing a high value of the superconducting (SC) transition temperature (Tc) due to Eu doping. At least two energy scales were observed from the PES data in the SC compound: One at ∼14 meV closing around Tc and thus corresponding to the SC gap. Another energy scale appears at ∼35 meV and survives at temperatures above Tc which represents the pseudogap (PG). The non-SC sample (La,Eu)FeAsO shows a PG at ∼ 41 meV. These observations in this new superconductor are consistent with the general trend followed by other compounds in the “1111” family.",

keywords = "Eu doping, Iron-based superconductors, Laser photoemission spectroscopy, Pseudogap, Superconducting gap, “1111” compounds",

author = "Walid Malaeb and Ramadan Awad and Taku Hibino and Yoichi Kamihara and Takeshi Kondo and Shik Shin",

note = "Funding Information: This work was supported by the JSPS KAKENHI ( 16H06013 , 16K13829 , 16H00979 , 16H02209 , 25220707 ), and by the Photon and Quantum Basic Research Coordinated Development Program from MEXT . This work was partially supported by Keio Gijuku Academic Development Funds . Publisher Copyright: {\textcopyright} 2017 Elsevier B.V.",

year = "2018",

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doi = "10.1016/j.physb.2017.10.049",

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AU - Malaeb, Walid

AU - Awad, Ramadan

AU - Hibino, Taku

AU - Kamihara, Yoichi

AU - Kondo, Takeshi

AU - Shin, Shik

N1 - Funding Information: This work was supported by the JSPS KAKENHI ( 16H06013 , 16K13829 , 16H00979 , 16H02209 , 25220707 ), and by the Photon and Quantum Basic Research Coordinated Development Program from MEXT . This work was partially supported by Keio Gijuku Academic Development Funds . Publisher Copyright: © 2017 Elsevier B.V.

PY - 2018/5/1

Y1 - 2018/5/1

N2 - We have implemented laser photoemission spectroscopy (PES) to investigate the electronic structure of the iron-based superconductor (La,Eu)FeAsO1-xFx (LaEu1111) which is an interesting compound in the “1111” family showing a high value of the superconducting (SC) transition temperature (Tc) due to Eu doping. At least two energy scales were observed from the PES data in the SC compound: One at ∼14 meV closing around Tc and thus corresponding to the SC gap. Another energy scale appears at ∼35 meV and survives at temperatures above Tc which represents the pseudogap (PG). The non-SC sample (La,Eu)FeAsO shows a PG at ∼ 41 meV. These observations in this new superconductor are consistent with the general trend followed by other compounds in the “1111” family.

AB - We have implemented laser photoemission spectroscopy (PES) to investigate the electronic structure of the iron-based superconductor (La,Eu)FeAsO1-xFx (LaEu1111) which is an interesting compound in the “1111” family showing a high value of the superconducting (SC) transition temperature (Tc) due to Eu doping. At least two energy scales were observed from the PES data in the SC compound: One at ∼14 meV closing around Tc and thus corresponding to the SC gap. Another energy scale appears at ∼35 meV and survives at temperatures above Tc which represents the pseudogap (PG). The non-SC sample (La,Eu)FeAsO shows a PG at ∼ 41 meV. These observations in this new superconductor are consistent with the general trend followed by other compounds in the “1111” family.

KW - Eu doping

KW - Iron-based superconductors

KW - Laser photoemission spectroscopy

KW - Pseudogap

KW - Superconducting gap

KW - “1111” compounds

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