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We have successfully synthesized the fluoride-arsenide compoundsCa$_{1-x}$RE$_x$FeAsF (RE=Nd, Pr; x=0, 0.6). The x-ray powder diffractionconfirmed that the main phases of our samples are Ca$_{1-x}$RE$_x$FeAsF withthe ZrCuSiAs structure. By measuring resistivity, superconductivity wasobserved at 57.4 K in Nd-doped and 52.8 K in Pr-doped samples with x=0.6. Bulksuperconductivity was also proved by the DC magnetization measurements in bothsamples. Hall effect measurements revealed hole-like charge carriers in theparent compound CaFeAsF with a clear resistivity anomaly below 118 K, while theHall coefficient $R_H$ in the normal state is negative for the superconductingsamples Ca$_{0.4}$Nd$_{0.6}$FeAsF and Ca$_{0.4}$Pr$_{0.6}$FeAsF. This indicatesthat the rare earth element doping introduces electrons into CaFeAsF whichinduces the high temperature superconductivity.

High-T_c superconductivity induced by doping rare earth elements into CaFeAsF