Low-temperature magnetic structure of UNiGe

Journal Article · Mon Jan 01 04:00:00 EST 1996 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.53.758· OSTI ID:283634

Purwanto, A ^[1]; Sechovsky, V; Havela, L ^[2]; Robinson, R A; Nakotte, H; Larson, A C ^[1]; Prokes, K; Brueck, E; de Boer, F R ^[3]

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1. Los Alamos Neutron Scattering Center, Los Alamos National Laboratory, New Mexico 87545 (United States)
2. Department of Metal Physics, Charles University, CZ-12116 Prague 2, (Czech Republic)
3. Van der Waals Zeeman Institute, University of Amsterdam, Valckenierstraat 65, 1018 XE Amsterdam (The Netherlands)

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.}

• OSTI ID: 283634
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 2 Vol. 53; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CERIUM COMPOUNDS
COMMENSURATE PHASES
DOMAIN STRUCTURE
INTERMETALLIC COMPOUNDS
IRREDUCIBLE REPRESENTATIONS
MAGNETIC PROPERTIES
NICKEL COMPOUNDS
SYMMETRY GROUPS
TEMPERATURE RANGE 0013-0065 K
URANIUM COMPOUNDS