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In the iron-pnictide material CeFeAsO not only the Fe moments, but also thelocal 4f moments of the Ce order antiferromagnetically at low temperatures. Weelucidate on the peculiar role of the Ce on the emergence of superconductivity.While application of pressure suppresses the iron SDW ordering temperaturemonotonously up to 4 GPa, the Ce-4f magnetism is stabilized, until both typesof magnetic orders disappear abruptly and a narrow SC dome develops. Withfurther increasing pressure characteristics of a Kondo-lattice system becomemore and more apparent in the electrical resistivity. This suggests aconnection of the emergence of superconductivity with the extinction of themagnetic order and the onset of Kondo-screening of the Ce-4f moments.

Electron doping of the iron-arsenide superconductor CeFeAsO controlled by hydrostatic pressure