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Author Purwanto, A. ♦ Sechovsky, V. ♦ Havela, L. ♦ Robinson, R. A. ♦ Nakotte, H. ♦ Larson, A. C. ♦ Prokes, K. ♦ Brueck, E. ♦ de Boer, F. R.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ CERIUM COMPOUNDS ♦ MAGNETIC PROPERTIES ♦ NICKEL COMPOUNDS ♦ URANIUM COMPOUNDS ♦ DOMAIN STRUCTURE ♦ INTERMETALLIC COMPOUNDS ♦ IRREDUCIBLE REPRESENTATIONS ♦ SYMMETRY GROUPS ♦ TEMPERATURE RANGE 0013-0065 K ♦ COMMENSURATE PHASES
Abstract We report on the magnetic structure of single-crystalline UNiGe in its low-temperature commensurate antiferromagnetic phase. UNiGe crystallizes in the orthorhombic TiNiSi structure type with space group {ital Pnma} and undergoes two magnetic transitions at 51 and 42 K. Our data, taken at 20 K, rule out both of the previously reported magnetic structures for the low-temperature phase, though we find an ordering vector {ital q}=(0,1/2,1/2) in agreement with the previous powder study of Murasik {ital et} {ital al}. [J. Phys. Condens. Matter {bold 3}, 1841 (1991)]. We observe both domains of the single-{ital q} structure, and show that this is preferred over a 2-{ital q} structure. We extract a moment of 0.91{mu}{sub {ital B}} per U atom, and it is likely that the moment lies within the {ital b}-{ital c} plane in a collinear moment-density-wave configuration. However, out-of-plane moment components are allowed by symmetry and our best refinement gives noncollinear canting out of the plane by approximately 20{degree}. This structure belongs to one of the two possible irreducible representations, and we discuss its relationship to a more conventional Shubnikov-group analysis. {copyright} {ital 1996 The American Physical Society.}
ISSN 01631829
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-01-01
Publisher Place United States
Journal Physical Review, B: Condensed Matter
Volume Number 53
Issue Number 2


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