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Using the de Haas-van Alphen effect we have measured the evolution of theFermi surface of BaFe_2(As_{1-x}P_x)_2 as function of isoelectric substitution(As/P) for 0.41<x<1 (T_c up to 25 K). We find that the volume of electron andhole Fermi surfaces shrink linearly with decreasing x. This shrinking isaccompanied by a strong increase in the quasiparticle effective mass as x istuned toward the maximum T_c. It is likely that these trends originate from themany-body interaction which give rise to superconductivity, rather than theunderlying one-electron bandstructure.

Evolution of the Fermi surface of BaFe_2(As_{1-x}P_x)_2 on entering the superconducting dome