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We have performed detailed studies of the temperature evolution of theelectronic structure in Ba(Fe(1-x)Ru(x))2As2 using Angle Resolved PhotoemissionSpectroscopy (ARPES). Surprisingly, we find that the binding energy of bothhole and electron bands changes significantly with temperature in pure and Rusubstituted samples. The hole and electron pockets are well nested at lowtemperature in unsubstituted (BaFe2As2) samples, which likely drives the spindensity wave (SDW) and resulting antiferromagnetic order. Upon warming, thisnesting is degraded as the hole pocket shrinks and the electron pocket expands.Our results demonstrate that the temperature dependent nesting may play animportant role in driving the antiferromagnetic/paramagnetic phase transition.

Unusual temperature dependence of band dispersion in Ba(Fe(1-x)Ru(x))2As2 and its consequences for antiferromagnetic ordering