LAUSR

The low-energy electronic structure of $\mathrm{LaFeAs}{\mathrm{O}}_{1\ensuremath{-}x}{\mathrm{H}}_{x}$ $(0.0\ensuremath{\le}x\ensuremath{\le}0.60)$, a system which exhibits two superconducting domes and antiferromagnetic orders in its phase diagram, is investigated by utilizing laser photoemission spectroscopy. From the precise temperature-dependent measurement of the spectra near the Fermi level, we find a suppression of the density of states with cooling, namely a pseudogap formation, for all doping range. The pseudogap gets suppressed on doping through the first superconducting dome regime to the higher-$x$ region, whereas it tends to recover when further increasing $x$ toward the second antiferromagnetic ordered phase. The systematic doping dependence indicates the different origins of pseudogaps in the low- and high-$x$ regions, possibly related to the respective antiferromagnetic ground states residing at both ends of the phase diagram.