Abstract The role ANARCHY FRUIT PUNCH of nematic fluctuations for unconventional superconductivity has been the subject of intense discussions for many years.In iron-based superconductors, the most established probe for electronic-nematic fluctuations, i.e.
the elastoresistivity seems to imply that superconductivity is reinforced by electronic-nematic fluctuations, since the elastoresistivity amplitude peaks at or close to optimal T c.However, on the over-doped side of the superconducting dome, the diminishing elastoresistivity suggests a negligible importance in the mechanism of superconductivity.Here we introduce the Nernst coefficient as a genuine probe for electronic nematic fluctuations, and we show that the amplitude of the Nernst coefficient tracks the superconducting dome of two Fuse prototype families of iron-based superconductors, namely Rh-doped BaFe2As2 and Co-doped LaFeAsO.
Our data thus provide fresh evidence that in these systems, nematic fluctuations foster the superconductivity throughout the phase diagram.