Abstract

Information on the nature of the anomalous ferromagnetic state and paramagnetic Kondo state of CeRh3B2 is gained by studying the evolution of the crystallographic, magnetic, and transport properties across the pseudoternary compounds Ce(Rh1-xCox)3B2. Unit cell volume variation with Co concentration parameter x indicates that the valence of Ce is increasing from a nearly trivalent value in the Rh-rich region to a high value for x > 0.3 and saturates around x ≈ 0.5. The destruction of ferromagnetism for x > 0.5 thus goes hand in hand with the delocalization of the Ce magnet moment.

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