Localized Magnetic Moment of Co Impurity in CrVCo Alloys

抄録

Magnetic susceptibility measurements on Cr_1−xV_xCo alloys containing 1 at % Co have been made in the range of x from zero to 1 over the temperature range 4.2 to 660 K. The susceptibility due to Co impurities above the Néel temperature follows Curie-Weiss law. The magnitude of the effective moment, about 3 μ_B in CrCo alloy, decreases monotonically with the increase of x, and the localized moment disappears in x=0.3 alloy. From the results of magnetic susceptibility and NMR measurements, it is concluded that the coexistence of magnetic and nonmagnetic Co atoms, at least for x=0.2 and 0.25 alloys, exists and that the formation of localized moment seems to depend on the configuration not only of nearest neighbors but also of long range.