Magnetic Susceptibility ofMn2+in CdS and Effects of Antiferromagnetic Exchange

Abstract

Magnetic-susceptibility measurements on spherical CdS single crystals containing manganese impurity ranging from 0.026 to 5.0% mole fraction have indicated the importance of next-nearest-neighbor (nnn) and higher interactions in the description of the susceptibility ${\chi }_{\mathrm{obs}}$ in the helium-temperature range. The observations imply that the nearest-neighbor (nn) interactions must have "locked-in" at temperatures well above 4°K and therefore $-\frac{J}{k}>4\mathrm{}°$K, where $J$ is the nn exchange integral. Within the range of uncertainty in the knowledge of the precise values of ${\chi }_{\mathrm{obs}}$ it may be deduced that the most important exchange parameters, the second-, third-, and fourth-nn parameters, are of the same order of magnitude, about 0.1°K.