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Updated: Apr 28, 2026
08:53
Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures
Published on: October 9, 2012
17.3K
Electronic structure of Eu(Fe0.79Ru0.21)2As2 studied by angle-resolved photoemission spectroscopy
Summary
Eu(Fe(0.79)Ru(0.21))2As2 is a nodeless superconductor, unlike related nodal superconductors. This study reveals its electronic structure, linking pnictogen height and orbital character to superconductivity behavior in iron-based materials.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Superconductivity
Background:
- Iron-based superconductors exhibit diverse superconducting behaviors.
- Pnictogen height (hPn) correlates with superconducting gap properties.
- Distinguishing nodal and nodeless superconductivity is crucial for understanding mechanisms.
Purpose of the Study:
- To investigate the low-lying electronic structure of Eu(Fe(0.79)Ru(0.21))2As2.
- To determine the orbital character of electronic bands contributing to the Fermi surface.
- To provide further evidence for the relationship between pnictogen height, orbital character, and nodal/nodeless superconductivity.
Main Methods:
- Angle-resolved photoemission spectroscopy (ARPES).
- Photon energy dependence measurements.
- Polarization dependence measurements to resolve 3D momentum space and orbital character.
Main Results:
- The dz2-originated ζ band in Eu(Fe(0.79)Ru(0.21))2As2 does not contribute spectral weight to the Fermi surface around Z.
- This contrasts with BaFe2(As(0.7)P(0.3))2 and Ba(Fe(0.65)Ru(0.35))2As2, which are nodal superconductors.
- Eu(Fe(0.79)Ru(0.21))2As2 has a larger hPn (>1.33 Å) compared to the nodal counterparts (<1.33 Å).
Conclusions:
- The findings support a direct relationship between the absence of nodes, the dz2 orbital character, and a larger pnictogen height.
- This research enhances the understanding of nodal superconductivity in iron-based superconductor systems.
- The study contributes to the broader field of superconductivity by elucidating key factors governing its behavior.
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