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The structural flexibility at three substitution sites in LaFeAsO enabledinvestigation of the relation between superconductivity and structuralparameters over a wide range of crystal compositions. Substitutions of Nd forLa, Sb or P for As, and F or H for O were performed. All these substitutionsmodify the local structural parameters, while the F/H-substitution also changesband filling. It was found that the superconducting transition temperature$T_{c}$ is strongly affected by the pnictogen height $h_{Pn}$ from the Fe-planethat controls the electron correlation strength and the size of the $d_{xy}$hole Fermi surface (FS). With increasing $h_{Pn}$, weak couplingsuperconductivity switches to the strong coupling one where the $d_{xy}$ holeFS is crucially important.

Importance of dxy orbital and electron correlation in iron-based superconductors revealed by phase diagram for 1111-system