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Among the Fe-based superconductors, Fe$_{1+y}$Te$_{1-x}$Se$_{x}$ is unique inthat its crystal structure is the simplest and the electron correlation levelis the strongest, and thus it is important to investigate thedoping($x$)-temperature ($T$) phase diagram of this system. However, inevitablyincorporated excess Fe currently prevents the establishment of the true phasediagram. We overcome the aforementioned significant problem via developing anew annealing method termed as "Te-annealing" wherein single crystals areannealed under Te vapor. Specifically, we conducted various magnetotransportmeasurements on Te-annealed superconducting Fe$_{1+y}$Te$_{1-x}$Se$_{x}$. Weobserved that crossover from the incoherent to the coherent electronic stateand opening of the pseudogap occurs at high temperatures ($\approx$ 150 K for$x$ = 0.2). This is accompanied by a more substantial pseudogap and theemergence of a phase with a multi-band nature at lower temperatures (below$\approx$ 50 K for $x$ = 0.2) before superconductivity sets in. Based on theresults, the third type electronic phase diagram in Fe-based high-$T_c$superconductors is revealed.

Electronic phase diagram of Fe$_{1+y}$Te$_{1-x}$Se$_{x}$ revealed by magnetotransport measurements