Abstract
The superconducting and magnetic properties of PrFePO and NdFePO are reported. Measurements of the dc and ac magnetic susceptibility reveal that, in comparison to the analogous compound without $f$ electrons, LaFePO, the superconducting transition temperatures ${T}_{c}$ are only moderately affected by the lanthanide 4$f$-electron magnetic moments. These results indicate that either the exchange interaction that leads to magnetic pair breaking is extremely weak or the superconducting state is unconventional. Measurements of the upper-critical-field curves and the magnetic susceptibility also reveal that the magnetic-field-induced suppression of the superconducting state is not strongly correlated with spin polarization of the magnetic lanthanide ions.
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