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Experiments on a stoichiometric single crystal show that the principal interaction is a commensurate antiferromagnetic ordering of the Fe sublattice, with a moment at 4.2 K of 1.08(2) µ(B) per Fe atom in the basal plane. However, symmetry arguments suggest that the Fe sublattice has a weak ferromagnetic component also in the basal plane. Experiments in a magnetic field with polarized neutrons establish that the ferromagnetic U moment is 0.47(2) µ(B) per U atom. In a magnetic field applied in the [010] direction (basal plane) the sublattice antiferromagnetism is aligned perpendicular to the field in the basal plane, (ie in the direction [100]). Combining the neutron magnetization results show that the weak Fe ferromagnetic component in zero field is about 0.3 µ(B) so that the canting angle of the Fe moments is 16 degrees. The weak ferromagnetism of the Fe sublattice assures that the two sublattices develop their moments in the same manner. This is different to the situation in the RFe(4)Al(8) (R = rare earth) compounds, in which the rare earth develops is full moment only at a lower temperature.

Additional information

Authors: PAIXÃO J A, University of Coimbra, Departamento de Física (PT);LEBECH B, Risø National Laboratory, Physics Department, Roskilde (DK);GONÇALVES A P, Instituto Technológico e Nuclear, Departamento de Química, Sacavém (PT);BROWN P J, Institut Laue-Langevin, Grenoble (FR);LANDER G H ET AL, JRC Karlsruhe (DE);BURLET P, CEA, CEN Grenoble (FR);DELAPALME A, CEA, CEN Saclay, Gif-sur-Yvette (FR);PAIX?O J A, University of Coimbra, Departamento de Fisica (PT);GONCALVES A P, Instituto Technologico e Nuclear, Departamento de Quimica, Sacavem (PT)
Bibliographic Reference: Article: Physical Review B Condensed Matter
Record Number: 199710407 / Last updated on: 1997-04-23
Original language: en
Available languages: en