Abstract
We studied the hybridization effect on the unstable ferromagnet CeFe 2 due to chemical pressure. The small amount of Co substitution for Fe induces a stable AF order at low temperatures. In the AF state, the substituted CeFe 2 shows a giant magnetoresistance at the metamagnetic transition, which originates from the collapse of superzone gap in the antiferromagnetic state. On the other hand, ferromagnetism is stabilized in (Ce 1− x Sc x )Fe 2, even though the lattice parameter decreases. This indicates that ferromagnetism is stabilized by the suppression of antiferromagnetic fluctuation coming from the reduction of 3d–4f hybridizations due to the decrease in the Ce content.
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