Abstract
We present a calorimetric study on single crystals of Ca(Fe1-xCox)(2)As-2 (x = 0, 0.032, 0.051, 0.056, 0.063, and 0.146). The combined first order spin-density wave/structural transition occurs in the parent CaFe2As2 compound at 168 K and gradually shifts to lower temperature for low doping levels (x = 0.032 and x = 0.051). It is completely suppressed upon higher doping x >= 0.056. Simultaneously, superconductivity appears at lower temperature with a transition temperature around T-c similar to 14.1 K for Ca(Fe0.937Co0.063)(2)As-2. The phase diagram of Ca(Fe0.937Co0.063)(2)As-2 has been derived and the upper critical field is found to be mu H-0(c2)(c) - 11.5 T and mu H-0(c2)(ab) = 19.4 T for the c and ab directions, respectively.