%0 Journal Article
%T Doping evolution of superconducting gaps and electronic densities of states in Ba(Fe1-xCox)2As2 iron pnictides
%A F. Hardy
%A P. Burger
%A T. Wolf
%A R. A. Fisher
%A P. Schweiss
%A P. Adelmann
%A R. Heid
%A R. Fromknecht
%A R. Eder
%A D. Ernst
%A H. v. Loehneysen
%A C. Meingast
%J Physics
%D 2010
%I arXiv
%R 10.1209/0295-5075/91/47008
%X An extensive calorimetric study of the normal- and superconducting-state properties of Ba(Fe1-xCox)2As2 is presented for 0 < x < 0.2. The normal-state Sommerfeld coefficient increases (decreases) with Co doping for x < 0.06 (x > 0.06), which illustrates the strong competition between magnetism and superconductivity to monopolize the Fermi surface in the underdoped region and the filling of the hole bands for overdoped Ba(Fe1-xCox)2As2. All superconducting samples exhibit a residual electronic density of states of unknown origin in the zero-temperature limit, which is minimal at optimal doping but increases to the normal-state value in the strongly under- and over-doped regions. The remaining specific heat in the superconducting state is well described using a two-band model with isotropic s-wave superconducting gaps.
%U http://arxiv.org/abs/1007.2218v1