Abstract
A wide-range doping was achieved by a high-pressure method for ${\text{TbFeAsO}}_{1\ensuremath{-}\ensuremath{\delta}}$ from ``underdoped'' to ``overdoped'' superconducting compositions throughout the optimized superconductivity (${T}_{\text{c}}$ of 44 K). ${T}_{\text{c}}$ vs $\ensuremath{\delta}$ shows a dome-shaped feature, while ${T}_{\text{c}}$ vs the lattice constant likely follows a unique empirical curve over the doping range. The relatively large amount of oxygen vacancies up to $\ensuremath{\sim}0.3$ per the formula unit was introduced possibly because of the smaller replacement Tb than the other Ln (rare-earth element) in the ${\text{LnFeAsO}}_{1\ensuremath{-}\ensuremath{\delta}}$ system.
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