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Magnetic interactions in NiSO4

The energy distributions of neutrons scattered by NiS04 in its paramagnetic state are measured by means of a time-of-flight technique. Restricting the range of the exchange interactions to the first and second nearest-neighbours, the relation (J1/kB)2 + 2(J2/kB)2 = = (149±7) °K2 is obtained from the second moment of these energy distributions. A second relation between the two exchange parameters is obtained from a computation of the Neel temperature in the Green's function approximation. From the two relations J1/kB = = (8 ± 0.8) °K and J2/kB = (−6.5 ± 0.6) °K are derived. Taking properly into account a temperature-independent contribution to the susceptibility, no experimental indication is found that there are other significant exchange interactions. 
 
 
 
Nous avons mesure la distribution en energie des neutrons diffuses par NiSO4 dans l'etat paramagnetique. En limitant la portee des interactions d'echange aux premiers et seconds voisins, nous obtenons du deuxieme moment de ces distributions la relation (J1/kB)2 + + 2(J2/kB)2 = (149 ± 7) °K2. Un calcul de la temperature de Neel suivant le formalisme des fonctions de Green fournit une deuxieme relation entre J1 et J2. Nous deduisons de ce systeme les valeurs J1/kB = (8 ± 0,8) °K, J2/kB = (−6,5 ± 0,6) °K. Si on tient compte de l'existence d'une contribution independante de la temperature a la susceptibilite, il n'y a pas d'evidence experimentale qu'il existe d'autres parametres significatifs.