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

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

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 (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 languageEnglish
JournalPhysica B: Condensed Matter
DOIs
Publication statusAccepted/In press - 2017 Jun 30

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

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