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We investigate the nature of the SDW (Spin Density Wave) transition in theunderdoped regime of an iron-based high Tc superconductor Ba(Fe1-xCox)2As2 by75As NMR, with primary focus on a composition with x = 0.02 (T_SDW = 99 K).Wedemonstrate that critical slowing down toward the three dimensional SDWtransition sets in at the tetragonal to orthorhombic structural phasetransition, Ts = 105 K, suggesting strong interplay between structuraldistortion and spin correlations. In the critical regime between Ts and T_SDW,the dynamical structure factor of electron spins S(q,Wn) measured with thelongitudinal NMR relaxation rate 1/T1 exhibits a divergent behavior obeying apower law, 1/T1~S(q, Wn)~(T/T_SDW-1)^a with the critical exponent a ~ 0.33.

Critical Behavior of the SDW Transition in Underdoped Ba(Fe1-xCox)2As2 (x <=0.05): 75As NMR Investigation