Physics – Condensed Matter – Superconductivity
Scientific paper
2011-03-03
Phys. Rev. B 83, 220505(R) (2011)
Physics
Condensed Matter
Superconductivity
4 pages, 4 figures
Scientific paper
10.1016/j.physc.2011.08.004
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 $\Delta(k+Q)=-\Delta(k)$ 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 $\Delta(k+Q)=\Delta(k)$. 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.
Graser Siegfried
Hirschfeld Peter J.
Maier Th. A.
Scalapino Douglas J.
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