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We report on specific heat measurements in Ba$_{1-x}$K$_x$Fe$_{2}$As$_{2}$($x\le 0.6$). For the underdoped sample with $x=0.2$ both the spin-density-wavetransition at $T = 100$ K and the superconducting transition at 23 K can beidentified. The electronic contribution to the specific heat in thesuperconducting state for concentrations in the vicinity of optimal doping$x=0.4$ can be well described by a full single-gap within the BCS limit.

Magnetic and superconducting transitions in Ba$_{1-x}$K$_x$Fe$_{2}$As$_{2}$ studied by specific heat