Phys. Rev. B 63, 134436 (2001) [6 pages]Helical magnetic structures in relativistic systems: The case of UPtGeReceived 22 November 2000; published 15 March 2001 The compound UPtGe is the only 5f system known to possess an incommensurate helical structure. The nature of this unique magnetic structure is studied within density-functional theory, and we show that the formation of a helical arrangement results from the coexistence of accidentally small in-plane magnetic anisotropy and frustrated exchange interactions. The system is not, however, a pure exchange helix since the Dzyaloshinski-Morija interaction plays an important role and the magnetic structure possesses features inherent only for relativistic helices. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.63.134436
DOI:
10.1103/PhysRevB.63.134436
PACS:
75.25.+z, 75.10.Lp, 75.30.Gw, 75.50.-y
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