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Heat capacity and anisotropic thermal expansion was measured forBa(Fe_{1-x}Co_x)_2As_2 (x = 0, 0.038, 0.074) single crystals. Thermal expansionis anisotropic and, in tetragonal phase, is significantly higher along thec-axis. Previously reported phase transitions, including possibly splitstructural and magnetic for x = 0.038 are clearly seen in both measurements.Uniaxial pressure derivatives of the superconducting transition temperatureinferred from the Ehrenfest relation have opposite signs for in-plane andc-axis pressures for both Ba(Fe_{0.962}Co_{0.038})_2As_2 andBa(Fe_{0.926}Co_{0.074})_2As_2, with the opposite sign of this anisotropy.

Thermal expansion and anisotropic pressure derivatives of T_c in Ba(Fe_{1-x}Co_x)_2As_2 single crystals