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We report the in-plane anisotropy of the Seebeck and Nernst coefficients aswell as of the electrical resistivity determined for the series of thestrain-detwinned single crystals of Ba(Fe1-xCox)2As2. Two underdoped samples (x= 0.024, 0.045) exhibiting the transition from the tetragonal paramagneticphase to the orthorhombic spin density wave (SDW) phase (at Ttr = 100 and 60 K,respectively) show an onset of the Nernst anisotropy at temperatures above 200K, which is significantly higher than Ttr. In the optimally doped sample (x =0.06) the transport properties also appear to be in-plane anisotropic below T =120 K, despite the fact that this particular composition does not show anyevidence of long-range magnetic order. However, the anisotropy observed in theoptimally doped crystal is rather small and for the Seebeck and Nernstcoefficients the difference between values measured along and across theuniaxial strain has opposite sign to those observed for underdoped crystalswith x = 0.024 and 0.045. For these two samples, insensitivity of the Nernstanisotropy to the SDW transition suggests that the nematicity might be of otherthan magnetic origin.

Thermoelectric anisotropy in Ba(Fe1-xCox)2As2 iron-based superconductor