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The phase diagram of LaFeAs$_{1-x}$P$_x$O system has been extensively studiedthrough hole- and electron-doping as well as As/P-substitution. It has beenrevealed that there are three different superconducting phases with differentFermi surface (FS) topologies and thus with possibly different pairing glues.One of them is well understood as spin fluctuation-mediated superconductivitywithin a FS nesting scenario. Another one with the FSs in a bad nestingcondition must be explained in a different context such as orbital or spinfluctuation in strongly correlated electronic system. In both phases,$T$-linear resistivity was commonly observed when the superconductingtransition temperature $T_{\rm c}$ becomes the highest value, indicating thatthe strength of bosonic fluctuation determines $T_{\rm c}$. In the lastsuperconducting phase, the nesting condition of FSs and the related bosonicfluctuation are moderate. Variety of phase diagram characterizes the multipleorbital nature of the iron-based superconductors which are just near theboundary between weak and strong correlation regimes.

Three superconducting phases with different categories of pairing in hole- and electron-doped LaFeAs$_{1-x}$P$_x$O