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An extensive calorimetric study of the normal- and superconducting-stateproperties of Ba(Fe1-xCox)2As2 is presented for 0 < x < 0.2. The normal-stateSommerfeld coefficient increases (decreases) with Co doping for x < 0.06 (x >0.06), which illustrates the strong competition between magnetism andsuperconductivity to monopolize the Fermi surface in the underdoped region andthe filling of the hole bands for overdoped Ba(Fe1-xCox)2As2. Allsuperconducting samples exhibit a residual electronic density of states ofunknown origin in the zero-temperature limit, which is minimal at optimaldoping but increases to the normal-state value in the strongly under- andover-doped regions. The remaining specific heat in the superconducting state iswell described using a two-band model with isotropic s-wave superconductinggaps.

Doping evolution of superconducting gaps and electronic densities of states in Ba(Fe1-xCox)2As2 iron pnictides