Effects of Temperature and Heat Treatment on the Short-Range Order in Cu-Mn Alloys

ATOMIC AND MAGNETIC SHORT RANGE ORDER IN Cu-Mn ALLOYS

“…Other important results to be mentioned here are : 1) the distribution of the diffuse scattering around the (3 10) type position is approximately ellipsoidal, elongated somewhat towards the [h 101 direction, 2) the shape of the intensity distribution of the diffuse peaks essentially does not change by decreasing the Mn content, although the distribution becomes more diffuse and appears to have a tendency of becoming more spherical [4].…”

“…It is, however, our position that this separation is not reliable for this alloy system in an unpolarized beam experiment. The temperature dependence (for increasing temperature) of the intensity of these peaks is shown in figure 3 for Cu-25 % Mn [4]. The measured variation of intensity is more rapid in the single crystal than in the polycrystal as can be seen by comparing the data of figures 1 and 3.…”

A magnetization study of the development of short-range order in a concentrated - Mn spin glass

“…The ensuing recommendation [27] that aging should be carried out at T = 210-260 • C discounts the reason for so many aging studies at temperatures near 100 • C, viz. the much greater enhancement of the magnetic properties achievable at the lower aging temperature, despite slow kinetics [23][24][25], and the demonstrated decrease of SRO at high temperatures [8,9].…”

“…Evidence for the connection between magnetic properties and short-range order (SRO) has come from many investigations using neutron scattering [3][4][5][6][7][8][9][10][11][12][13]. The spherically averaged atomic and magnetic SRO parameters were generally found to be negative at the nearest-neighbour (nn) position and 'in phase' among the next few neighbours, meaning that the atomic and magnetic SRO parameters tend to have the same sign, and to increase in magnitude with aging.…”