Abstract
Since their discovery in 2008, the Fe-based superconductors have attracted a great deal of interest. Regrettably, the mechanism(s) responsible for the superconductivity has yet to be unequivocally identified. High pressure is an important variable since its application moderates the pairing interaction. Thus far, the $\mathit{Ln}$FePO ($\mathit{Ln}$ = La, Pr, Nd, Sm, Gd) family of superconductors has received relatively little attention. Early high-pressure studies on LaFePO found that ${T}_{c}$ initially increased with pressure before passing through a maximum at higher pressures. The present studies on both polycrystalline and single-crystalline LaFePO, PrFePO, and NdFePO utilize the most hydrostatic pressure medium available, i.e., dense He. Surprisingly, for all samples, ${T}_{c}$ is found to initially decrease rapidly with pressure at the rate $d{T}_{c}/dP\ensuremath{\simeq}\ensuremath{-}2$ to $\ensuremath{-}3$ K/GPa. Less hydrostatic pressure media thus appear to enhance the value of ${T}_{c}$ in these materials. These results give yet further evidence that the superconducting state in Fe-based superconductors is extraordinarly sensitive to lattice strain.
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