Doping dependence of the specific heat of single-crystal BaFe2(As1-xPx)2

We present specific heat measurements on a series of BaFe2(As1-xPx )2 single crystals with phosphorous doping ranging from x = 0.3 to x = 0.55. Our results reveal that BaFe2(As1-xPx )2 follows the scaling C/Tc ≈ T 2 c remarkably well. The clean-limit nature of this material imposes additional restraints on theories aimed at explaining the scaling. Furthermore, we find that the Ginzburg-Landau parameter decreases significantly with doping whereas the superconducting anisotropy is ≈ 2.6, independent of doping.