Inelastic neutron and x-ray scattering as probes of the sign structure of the superconducting gap in iron pnictides

Thomas A. Maier; Siegfried Graser; Peter J. Hirschfeld; Douglas J. Scalapino

doi:10.1103/PhysRevB.83.220505

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Inelastic neutron and x-ray scattering as probes of the sign structure of the superconducting gap in iron pnictides

Thomas A. Maier, Siegfried Graser, Peter J. Hirschfeld, Douglas J. Scalapino

DOI 10.1103/PhysRevB.83.220505 · Physical Review B

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Abstract

Neutron spin-flip scattering observations of a resonance in the superconducting state is often taken as evidence of an unconventional superconducting state in which the gap changes sign Δ(k+Q)=−Δ(k) for momentum transfers Q which play an important role in the pairing. Recently questions regarding this identification for the Fe-pnictide superconductors have been raised and it has been suggested that Δ(k+Q)=Δ(k). Here we propose that inelastic neutron or x-ray scattering measurements of the spectral weight of a phonon of momentum Q can distinguish between these two pairing scenarios.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
BaFe1.85Co0.15As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown