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Evidence of nematic effects in the mixed superconducting phase of slightlyunderdoped $\text{Ba}(\text{Fe}_{1-x}\text{Co}_x)_2\text{As}_2$ is reported. Wehave found strong in-plane resistivity anisotropy for crystals in differentstrain conditions. For these compositions, there is no magnetic long rangeorder, so the description may be ascribed to the interplay between thesuperconducting and nematic order parameters. A piezoelectric-based apparatusis used to apply tensile or compressive strain to tune nematic domainorientation in order to examine intrinsic nematicity. Measurements are doneunder a rotating magnetic field and the analysis of the angular dependence ofphysical quantities identifies the cases in which the sample is {\emdetwinned}. Furthermore, the angular dependence of the data allows us toevaluate the effects of nematicity on the in-plane superconductor stiffness.Our results show that although nematicity contributes in a decisive way in theconduction properties, its contributions to the anisotropy properties of thestiffness of the superconducting order parameter is not as significant in thesesamples.

Nematicity in the superconducting mixed state of strain detwinned underdoped $\text{Ba}(\text{Fe}_{1-x}\text{Co}_x)_2\text{As}_2$