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We have carried out in-plane resistivity measurements under a uniaxialpressure in NaFe$_{1-x}$Co$_x$As single crystals. A clear distinction of thein-plane resistivity $\rho_a$ and $\rho_b$ with the uniaxial pressure along$b$-axis was discovered in the parent and underdoped regime with the dopinglevel up to about x=0.025$\pm$0.002. From the deviating point of $\rho_a$ and$\rho_b$, and the unique kinky structure of resistivity together with thepublished data we determined the temperatures for the nematic, structural andantiferromagnetic transitions. It is clearly shown that the nematic electronicstate vanishes simultaneously with the structural transition. Theantiferromagnetic state disappears however at a lower doping level. Ourresults, in combination with the data in BaFe$_{2-x}$Co$_x$As$_2$, indicate aclose relationship between nematicity and superconductivity.

Simultaneous Vanishing of the Nematic Electronic State and the Structural Orthorhombicity in NaFe$_{1-x}$Co$_x$As Single Crystals