Abstract
We report results of calculations that explain in the itinerant electron picture the noncollinear magnetic structure observed in the two very different compounds U 2Pd 2Sn and U 3P 4. We use the local approximation to spin-density functional theory and the ASW method incorporating spin-orbit coupling (SOC), noncollinear moment arrangements and an effective orbital field responsible for Hund's second rule. We show how the relativistic effect of SOC and the particular symmetry properties of the compounds cooperate and lead to noncollinear magnetic structures, in the case of U 2Pd 2Sn to an antiferromagnetic and in the case of U 3P 4 to a ferromagnetic structure, the latter possessing a weak antiferromagnetic component.
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