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The three-dimensional Fermi surface morphology of superconductingBaFe_2(As_0.37}P_0.63)_2 with T_c=9K, is determined using the de Haas-vanAlphen effect (dHvA). The inner electron pocket has a similar area and k_zinterplane warping to the observed hole pocket, revealing that the Fermisurfaces are geometrically well nested in the (\pi,\pi) direction. Theseresults are in stark contrast to the Fermiology of the non-superconductingphosphides (x=1), and therefore suggests an important role for nesting inpnictide superconductivity.

Enhanced Fermi surface nesting in superconducting BaFe$_2$(As$_{1-x}$P$_x$)$_2$ revealed by de Haas-van Alphen effect