MAGNETIC SMALL-ANGLE SCATTERING FROM CU-17 AT.PERCENT MN

Two Cu-17 at.% Mn single crystals quenched to room temperature after a ging at 483 and 553 K, respectively, were investigated by small-angle neutron scattering between room temperature and 15 K. While nuclear sm all-angle scattering is low and increases only slightly towards the di rect beam, strong magnetic small-angle scattering is observed. Its int ensity increases with increasing degree of chemical short-range order and decreasing temperature. The correlation lengths for chemical and ( static) ferromagnetic fluctuations are comparable.