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An important issue in the study of the iron-arsenic based superconductors isthe symmetry of the superconducting gap, a problem complicated by multiple gapson different Fermi surface sheets. Electronic Raman scattering is a flexiblebulk probe which allows one in principle to determine gap magnitudes and testfor gap nodes in different regions of the Brillouin zone by employing differentphoton polarization states. Here we calculate the clean Raman intensity for$A_{1g}$, $B_{1g}$ and $B_{2g}$ polarizations, and discuss the peak structuresand low-energy power laws which might be expected for several popular models ofthe superconducting gap in these systems.

Probing the pairing symmetry of the iron pnictides with electronic Raman scattering