Raman-Scattering Detection of Nearly Degenerate \(s\)-Wave and \(d\)-Wave Pairing Channels in Iron-Based Ba\(_{0.6}\)K\(_{0.4}\)Fe\(_2\)As\(_2\) and Rb\(_{0.8}\)Fe\(_{1.6}\)Se\(_2\) Superconductors

We show that electronic Raman scattering affords a window into the essential properties of the pairing potential \(V_{\mathbf{k},\mathbf{k^{\prime}}}\) of iron-based superconductors. In Ba\(_{0.6}\)K\(_{0.4}\)Fe\(_2\)As\(_2\) we observe band dependent energy gaps along with excitonic Bardasis-Schrie...

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Published in:arXiv.org 2015-07
Main Authors: Kretzschmar, Florian, Muschler, Bernhard, Böhm, Thomas, Baum, Andreas, Hackl, Rudi, Hai-Hu, Wen, Tsurkan, Vladimir, Deisenhofer, Joachim, Loidl, Alois
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Language:English
Subjects:
Energy gap
Excitons
Fermi surfaces
Iron
Lattice vibration
Raman spectra
Superconductivity
Symmetry
Topology
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creator Kretzschmar, Florian
Muschler, Bernhard
Böhm, Thomas
Baum, Andreas
Hackl, Rudi
Hai-Hu, Wen
Tsurkan, Vladimir
Deisenhofer, Joachim
Loidl, Alois
description We show that electronic Raman scattering affords a window into the essential properties of the pairing potential \(V_{\mathbf{k},\mathbf{k^{\prime}}}\) of iron-based superconductors. In Ba\(_{0.6}\)K\(_{0.4}\)Fe\(_2\)As\(_2\) we observe band dependent energy gaps along with excitonic Bardasis-Schrieffer modes characterizing, respectively, the dominant and subdominant pairing channel. The \(d_{x^2-y^2}\) symmetry of all excitons allows us to identify the subdominant channel to originate from the interaction between the electron bands. Consequently, the dominant channel driving superconductivity results from the interaction between the electron and hole bands and has the full lattice symmetry. The results in Rb\(_{0.8}\)Fe\(_{1.6}\)Se\(_2\) along with earlier ones in Ba(Fe\(_{0.939}\)Co\(_{0.061}\))\(_2\)As\(_2\) highlight the influence of the Fermi surface topology on the pairing interactions.
doi_str_mv 10.48550/arxiv.1208.5006
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subjects Energy gap
Excitons
Fermi surfaces
Iron
Lattice vibration
Raman spectra
Superconductivity
Symmetry
Topology
title Raman-Scattering Detection of Nearly Degenerate \(s\)-Wave and \(d\)-Wave Pairing Channels in Iron-Based Ba\(_{0.6}\)K\(_{0.4}\)Fe\(_2\)As\(_2\) and Rb\(_{0.8}\)Fe\(_{1.6}\)Se\(_2\) Superconductors
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