Hydrostatic and chemical pressure tuning of CeFeAs 1-xP xO single crystals

Abstract

We carried out a combined P substitution and hydrostatic pressure study on CeFeAs 1-xP xO single crystals in order to investigate the peculiar relationship of the local moment magnetism of Ce, the ordering of itinerant Fe moments, and their connection with the occurrence of superconductivity. Our results evidence a close relationship between the weakening of Fe magnetism and the change from antiferromagnetic to ferromagnetic ordering of Ce moments at p *=1.95 GPa in CeFeAs 0.78P 0.22O. The absence of superconductivity in CeFeAs 0.78P 0.22O and the presence of a narrow and strongly pressure sensitive superconducting phase in CeFeAs 0.70P 0.30O and CeFeAs 0.65P 0.35O indicate the detrimental effect of the Ce magnetism on superconductivity in P-substituted CeFeAsO. © 2012 American Physical Society.