Magnetic properties of Uranium and Plutonium Laves phases with 3d transition elements

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Abstract
We have measured the magnetization of UMn2, UFe2, UCo2, UNi2, PuMn2, PuFe2, PuCo2, and PuNi2 from 4–300 K in fields up to 14 kOe. The susceptibility of UMn2 shows a small maximum near 240 K (which may indicate an antiferromagnetic transition) in agreement with previous results. Our data for UFe2, UCo2 and UNi2 are not in good agreement with earlier work; the ferromagnetic ordering temperature (158 K) of a single crystal sample of UFe2 is lower than any reported value, UNi2 orders ferromagnetically at 30 K, and UCo2 may order below 5 K. In contrast, PuMn2, PuCo2 and PuNi2 have small weakly‐temperature‐dependent susceptibilities. PuFe2 is ferromagnetic at room temperature, in agreement with previous Mössbauer results, and has a saturation moment of ∠2.6μ B /mole.

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