Abstract
We have carried out neutron polarization analysis experiments, and unpolarized neutron scattering experiments, on annealed single crystal Cu-Mn samples of 5, 10, 15 and 25 atomic percent Mn. Peaks in the magnetic diffuse scattering are found at the [1, 1/2±δ, 0]-type positions in reciprocal space, where δ = 0.34, 0.29, 0.25 and 0.19 for the 5, 10, 15 and 25 percent Mn samples respectively. This magnetic scattering is symmetry-related to the diffuse nuclear scattering centered at the [1, 1/2, 0]-type positions arising from atomic short range order. The intensity of this diffuse magnetic scattering in all of the alloys decreases smoothly with temperature, approaching zero in the range 300–350 K. The spin-spin correlation range, as judged from the width of the magnetic diffuse peaks, also decreases smoothly with temperature. Neither the width nor the intensity of this magnetic scattering gives any hint of a freezing transition at lower temperature.
Highlights
The curious magnetic properties of Cu-Mn alloys in thea-solid solution range have attracted considerable attention for a very long time [1,2,3]
It is clear that the magnetic diffuse scattering is symmetry-related to the short range order nuclear scattering
The magnetic diffuse peaks at [h ± 6,1,0] along this line arises from scattering from the same regions of the macroscopic crystal as those that give rise to the diffuse nuclear scattering at [%,l,0]
Summary
The curious magnetic properties of Cu-Mn alloys in thea-solid solution range have attracted considerable attention for a very long time [1,2,3]. It is clear that the macroscopic magnetic properties of these alloys depends intimately upon the spatial distribution of atoms in the crystals; that is, on the short range atomic order. It is known from neutron scattering experiments that the short range atomic order increases with annealing [10].
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