ATOMIC AND MAGNETIC SHORT RANGE ORDER IN Cu-Mn ALLOYS

Abstract

RBsumB. -Dans cette publication, nous abordons quatre points fondamentaux du comportement de l'alliage Cu(Mn) :1) L'evolution du fond de diffusion de neutrons avec la tempdrature, en relation avec la structure Clectronique.2) La persistance d'un ordre a courte distance elevd dans un large domaine de tempkrature.3) La valeur &levee de la concentration critique nkcessaire pour atteindre I'ttat antiferromagnktique dans les rkseaux c. f. c. 4) Le comportement mictomagnetique des alliages c. f. c.

Magnetic properties and giant moment clusters in Be2Mn 1-xFex compounds

“…These domains are assumed to result from short range forces, the net effect of which is to couple the nearest neighbour Mn atoms antiferromagnetically and those of larger separation ferromagnetically. This last assumption has been confirmed by neutron diffraction on Cu-Mn alloys [35]. The magnetic properties of Au4Mn compounds [26] at low temperatures, especially the decrease of the average cluster moment and the increase of the cluster concentration by lowering the temperature, were also related to the increasing importance of antiferromagnetic interactions.…”