Nematic fluctuations mediated superconductivity revealed by anisotropic strain in Ba(Fe1-xCox)2As2
Abstract
Anisotropic strain is an external field capable of selectively addressing the role of nematic fluctuations in promoting superconductivity. We demonstrate this using polarization-resolved elasto-Raman scattering to probe the evolution of nematic fluctuations under strain in the normal and superconducting states of the paradigmatic iron-based superconductor Ba(Fe1-xCox)2As2. In the non-superconducting parent compound BaFe2As2 we observe a strain-induced suppression of the nematic susceptibility which follows the expected behavior of an Ising order parameter under a symmetry breaking field. For the superconducting compound, the suppression of the nematic susceptibility correlates with the decrease of the superconducting critical temperature Tc. Our results indicate a significant contribution of nematic fluctuations to electron pairing and validate theoretical scenarios of enhanced Tc near a nematic quantum critical point.
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