Neutron diffraction study of the magnetic ordering in the system
I S Dubenko; I V Golosovsky; A S Markosyan; I Mirebeau
Журнал:
Journal of Physics: Condensed Matter
Дата:
1998-12-21
Аннотация:
The magnetic and crystal structure of the as-cast cubic compounds was studied using neutron powder diffraction. The samples showed substantial inhomogeneity and consisted of at least two C15-type crystal phases. In the first phase predominating in (96.3%) ferrimagnetic long range order is stable. The second phase with the cell parameter lying within the narrow range 7.49-7.52 Å shows an incommensurate magnetic structure with a wave vector weakly dependent on x. Short range correlations of an antiferromagnetic type along with long range ordering were observed. The diffuse maxima lie at the positions corresponding to the Bragg reflections with half-integer indices and are ascribed to short range correlations based on the MnO-type antiferromagnetic structure developed within clusters of Å in size. No volume effect associated with the onset of Mn magnetism was observed up to x = 0.1.
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