Phase diagram with doping dependence in phosphorous-doped iron-based superconductor and magnetic order study

Recent experiments discover the isovalent doping can induce superconductivity in a unique iron-based superconductor, BaFe2(As1-xPx)2, through substitution of phosphorous (P) for arsenic (As). While the phosphorous (P-) doping is often considered not to alter the occupation of Fe-3d bands, surprisingly, it has the similar phase diagram just like the heterovalent doped cases: with the P-doping, the magnetic order is suppressed and the superconductivity emerges. Here we theoretically give a possible explanation of the phase diagram based on a recent minimal two-orbital tight-binding model. Moreover, through the spin susceptibility calculation, we try to study the effect of the hopping parameters on the magnetic order.