First order transition from antiferromagnetism to ferromagnetism in Ce(Fe${}_{0.96}$Al${}_{0.04}{)}_2$

Abstract

Results of dc magnetization study are presented showing interesting thermomagnetic history effects across the antiferromagnetic to ferromagnetic transition in Ce(Fe${}_{0.96}$Al${}_{0.04}{)}_2$. Specifically, we observe (i)ZFC/FC irreversibility rising with increasing field; (ii) virgin curve lying outside the envelope M-H curve. We argue that these effects are quite different from the characteristics seen in spin-glasses or in hard ferromagnets; they can be understood as metastabilities associated with a first order magnetic phase transition.

10 pages and 5 figures

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