Theory of Raman response of a superconductor with extended s-wave symmetry: Application to the iron pnictides

Andrey V. Chubukov; Ilya Eremin; Maxim M. Korshunov

doi:10.1103/PhysRevB.79.220501

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Theory of Raman response of a superconductor with extended s-wave symmetry: Application to the iron pnictides

Andrey V. Chubukov, Ilya Eremin, Maxim M. Korshunov

DOI 10.1103/PhysRevB.79.220501 · Physical Review B

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Abstract

We argue that Raman study of Fe-pnictides is a way to unambiguously distinguish between various superconducting gaps proposed for these materials. We show that A1g Raman intensity develops a true resonance peak below 2Δ if the pairing gap has A1g symmetry in the folded Brillouin zone (Δ(k=0)=Δ,Δ(π,π)=−Δ). No such peak develops for a pure s-wave gap, a d-wave gap, and an extended s-wave gap with Δ(k)=Δ coskx2cosky2. We show that the peak remains quite strong for the values of interpocket impurity scattering used to fit NMR data.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Fe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	55	Pressure not reported	unknown