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We use inelastic neutron scattering to study the crystalline electric field(CEF) excitations of Ce$^{3+}$ in CeFeAsO$_{1-x}$F$_{x}$($x=0,0.16$). Fornonsuperconducting CeFeAsO, the Ce CEF levels have three magnetic doublets inthe paramagnetic state, but these doublets split into six singlets when Fe ionsorder antiferromagnetically. For superconducting CeFeAsO$_{0.84}$F$_{0.16}$($T_c=41$ K), where the static AF order is suppressed, the Ce CEF levels havethree magnetic doublets at $\hbar\omega=0,18.7,58.4$ meV at all temperatures.Careful measurements of the intrinsic linewidth $\Gamma$ and the peak positionof the 18.7 meV mode reveal clear anomaly at $T_c$, consistent with a strongenhancement of local magnetic susceptibility $\chi^{\prime\prime}(\hbar\omega)$below $T_c$. These results suggest that CEF excitations in the rare-earthoxypnictides can be used as a probe of spin dynamics in the nearby FeAs planes.

The crystalline electric field as a probe for long range antiferromagnetic order and superconductivity in CeFeAsO$_{1-x}$F$_x$