Antiferromagnetic order in pureCeFe2under pressure

Abstract

The low temperature and high pressure ferromagnetic and antiferromagnetic phases of pure single crystals of $\mathrm{Ce}{\mathrm{Fe}}_{2}$ and cobalt doped $\mathrm{Ce}{({\mathrm{Fe}}_{1\ensuremath{-}x}{\mathrm{Co}}_{x})}_{2}$ 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 $\mathrm{Ce}{\mathrm{Fe}}_{2}$, a probable switch to an antiferromagnetic ground state at low temperature occurs at a pressure of less than $2\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$, and the ferromagnetic state is completely replaced at a pressure of about $6\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$. This ground state is discussed in light of previous experiments on the cobalt and aluminum doped systems.