Short-range magnetic order in Cu-Mn

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Abstract
Polarized‐neutron scattering experiments were performed on a Cu 8 0Mn2 0 alloy crystal at and above 4.2°K in a 100 kOe superconducting magnet, in a study of the relation between the magnetic and atomic short‐range order. The atomic correlations give rise to diffuse diffraction peaks at (1 1/2 O) and equivalent positions. The magnetic‐nuclear interference cross‐section ‐=[σ↑ (k)−σ↓ (k)] at these positions increases monotonically with applied magnetic field, whereas the sum cross‐section E=[σ↑ (k)+σ↓ (k)] is independent of both field and temperature below 78°K. A careful mapping was made of the cross sections in the [001] zone at T=78°K and Hz=52 kOe. Both ‐ and Σ show broad maxima only around the (1 1/2 O) positions; however, their shape is slightly different. The ratio ‐/Σ shows two maxima, approximately at the positions (1 4/10 O), (1 6/10 O). The inequivalence of the two cross sections indicates that the magnetic moments of manganese do not respond uniformily to the applied magnetic field, but instead they are modulated at the regions chemically more ordered, that have higher susceptibility.

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