Münster 1997 – wissenschaftliches Programm

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AM: Magnetismus

AM 2: Elektronentheorie und Modelle geordneter Spinstrukturen I

AM 2.7: Vortrag

Montag, 17. März 1997, 11:45–12:00, F4

Non-collinear magnetic structures in UTX and UX compounds. — •L.M. Sandratskii and J. K"ubler — Institut für Festkörperphysik, Technische Hochschule, 64289 Darmstadt

We continue our studies (see, e.g., [1]) of magnetic structure and electron properties of various Uranium compounds. In the present contribution we contrast the magnetic structures of UTX with those of UX compounds. Using UPdSn as an example of UTX compounds, we show that in this case we deal with a non-collinear magnetic structure that is predetermined by symmetry. We show how an interplay of two physical phenomena, the spin-orbit coupling and the hybridization between the U 5f and states of the Pd and Sn atoms, leads with certainty to noncollinearity of the magnetic structure. By means of the example of USb we show that in this case we deal with an essentially different type of non-collinearity wich results from a balance between different ineractions and therefore cannot be predicted without a direct calculation. Also the densities of states and the values of magnetic moments are reported and compared with experiment.

[1] L.M.Sandratskii and J. K"ubler, PRL 75 (1995) 946, Physica B, 217 (1996) 167.