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We have performed several high-pressure resistivity experiments on therecently discovered superconductors La[O_{0.89}F_{0.11}]FeAs andCe[O_{0.88}F_{0.12}]FeAs. At ambient pressure, these materials havesuperconducting onset temperatures T_c of 28 K and 44 K, respectively. Whilethe T_c of La[O_{0.89}F_{0.11}]FeAs goes through a maximum between 10-68 kbar,in qualitative agreement with a recent report by Takahashi et al., the T_c ofCe[O_{0.88}F_{0.12}]FeAs decreases monotonically over the measured pressurerange. At 265 kbar, the T_c of the cerium-based compound has been suppressedbelow 1.1 K.

Effect of pressure on the superconducting critical temperature of La[O_{0.89}F_{0.11}]FeAs and Ce[O_{0.88}F_{0.12}]FeAs