The low temperature and high pressure ferromagnetic and antiferromagnetic phases of pure single crystals of CeFe2 and cobalt doped Ce(Fe1-xCox)(2) are studied by ac susceptibility measurements. We find that in the cobalt doped system, the low temperature antiferromagnetic phase is reinforced by the application of pressure. In pure CeFe2, a probable switch to an antiferromagnetic ground state at low temperature occurs at a pressure of less than 2 GPa, and the ferromagnetic state is completely replaced at a pressure of about 6 GPa. This ground state is discussed in light of previous experiments on the cobalt and aluminum doped systems.
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