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We study the antiferromagnetic (AFM) and structural phase transitions insingle crystal $BaFe_2(As_{1-x}P_x)_2$ $(x=0, 0.3)$ at temperatures $T_N$ and$T_S$, respectively, by high resolution ac microcalorimetry and SQUIDmagnetometry. The specific heat measurements of both as grown and annealed$BaFe_2As_2$ displays a sharp peak at the AFM/Structural transitions. A kink inthe entropy of annealed $BaFe_2As_2$ gives evidence for splitting of the twotransitions by approximately 0.5K. No additional features could be identifiedin the specific heat of both $BaFe_2As_2$ and $BaFe_2(As_{0.7}P_{0.3})_2$ inthe temperature regions around $T^*$ > $T_S$ where torque measurements [S.Kasahara et al., Nature 486, 382 (2012)] had revealed the "true" nematic phasetransition, indicating that the behavior at $T^*$ does not represent a 2ndorder phase transition, and that the phase transition of$BaFe_2(As_{1-x}P_x)_2$ into the orthorhombic phase does occur at $T_S$.

Study of antiferromagnetic and nematic phase transitions in $BaFe_2(As_{1-x}P_x)_2$ by AC micro-calorimetry and SQUID magnetometry