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The isovalent-substituted iron-pnictide superconductorSrFe$_{2}$(As$_{1-x}$P$_{x}$)$_{2}$ ($x$=0.35) has a slightly higher optimumcritical temperature than the similar systemBaFe$_{2}$(As$_{1-x}$P$_{x}$)$_{2}$, and its parent compound SrFe$_{2}$As$_{2}$has a much higher N\'eel temperature than BaFe$_{2}$As$_{2}$. We have studiedthe band structure and the Fermi surfaces of optimally-dopedSrFe$_{2}$(As$_{1-x}$P$_{x}$)$_{2}$ by angle-resolved photoemissionspectroscopy (ARPES). Three holelike Fermi surfaces (FSs) around (0,0) and twoelectronlike FSs around ($\pi$,$\pi$) have been observed as in the case ofBaFe$_{2}$(As$_{1-x}$P$_{x}$)$_{2}$. Measurements with different photonenergies have revealed that one of the hole FSs is more strongly warped alongthe $k_{z}$ direction than the corresponding one inBaFe(As$_{1-x}$P$_{x}$)$_{2}$, while the electron FSs are almost cylindricalunlike corrugated ones in BaFe(As$_{1-x}$P$_{x}$)$_{2}$. Comparison of theARPES data with first-principles band-structure calculation revealed that thequasiparticle mass renormalization factors are different not only between bandsof different orbital character but also between the hole and electron FSs ofthe same orbital character. By examining nesting conditions between the holeand electron FSs, we conclude that magnetic interactions between FeAs layersrather than FS nesting play an important role in stabilizing theantiferromagnetic order. The insensitivity of superconductivity to the FSnesting can be explained if only the $d_{xy}$ and/or $d_{xz/yz}$ orbitals areactive in inducing superconductivity or if FS nesting is not important forsuperconductivity.

physical review. b, condensed matter and materials physics

Strongly three-dimensional electronic structure and Fermi Surfaces of  SrFe$_{2}$(As$_{0.65}$P$_{0.35}$)$_{2}$: Comparison with  BaFe$_{2}$(As$_{1-x}$P$_{x}$)$_{2}$