Superconducting Gaps via Raman Scattering in Iron Superconductors

TL;DR

This study uses Raman scattering to analyze superconducting gaps in iron-based superconductors, confirming the dominance of s-wave pairing and validating the S4 model's effectiveness in describing their electronic properties.

Contribution

It demonstrates that a simple coskxcosky gap function aligns well with experimental Raman data, supporting the S4 model's accuracy for iron superconductors.

Findings

Raman peaks match superconducting gaps measured by other techniques.

The coskxcosky gap function agrees with experimental data.

The S4 model effectively captures electronic and magnetic properties.

Abstract

We investigate non-resonant Raman response for iron-based superconductors using the framework of an effective S4 model that was recently proposed to capture the essential electronic and magnetic properties of Iron based superconductors. We compute the momentum matrix elements and the resulting Raman vertices exactly for different polarization geometries and amazingly find that a simple coskxcosky superconducting gap function is in good agreement with experimental data measured in both iron-pnictides and iron-chalcogenides. The Raman peaks are also matched quantitatively with the measured superconducting gaps by other experimental techniques. The result strengthens the validity of the S4 model and the dominance of the s-wave pairing for iron-based superconductors.