Caloric determination of the anisotropic phase diagram of BaFe$_{2}$(As$_{1-x}$P$_{x}$)$_{2}$ crystals

We report specific heat measurements on a series of BaFe$_{2}$(As$_{1-x}$P$_{x})_{2}$ single crystals with phosphorous contents ranging from optimal doping (x$\sim $0.3, T$_{c}$ = 29.5 K) to highly overdoped (x$\sim $0.6, T$_{c}$ = 11K). We find a sharp superconducting transition at T$_{c}$ for all doping levels, a suppression of the $\Delta $C-step at T$_{c }$with increasing doping and enhanced magnetic field dependence at higher doping. The phase diagrams determined from specific heat data show a decrease of dH$_{c2}$/dT with increasing doping and a nearly constant superconducting anisotropy of $\Gamma \sim $2.5. Our results will be compared with the proposed ``universal'' scaling of $\Delta $C$_{p}$/T$_{c}$ and dH$_{c2}$/dT due to quantum criticality and non Fermi liquid behavior [1] and due to strong pair-breaking and non-magnetic interband scattering [2], respectively. \\[4pt] [1] J. Zaanen, Phys. Rev. B 80, 212502 (2009) \\[0pt] [2] V. G. Kogan, Phys. Rev. B 80, 214532 (2009)