Magnetic Properties of Dilute Alloys of Cr, Mn, and Ni in4dand5dTransition Metals

Magnetic-susceptibility measurements between 4 and 300°K of dilute magnetic alloys of Cr, Mn, and Ni in various $4d$ and $5d$ transition metals are reported. Mn in Mo and Rh shows a localized magnetic moment with Kondo-type behavior. Below the Kondo temperature $T_K$, the susceptibility increases, by a term proportional to ($\frac{T_K}{T}$); faster than the Curie-Weiss law. This logarithmic term seems to be common to all dilute magnetic alloys of $3d$ solutes in transition metals. In addition to a localized moment, Mn causes a large change in the temperature-independent susceptibility of the order of ${10}^{-3\mathrm{}}$ emu per mole of solute. Similar large changes are also observed for other dilute magnetic alloys. It seems to be quite general that the occurrence of localized moment in dilute alloys is accompanied by a large increase in the temperature-independent susceptibility. These increases are too large to be understood within the present theories of localized magnetic states. Large increases in the temperature-independent susceptibility are also observed for some alloys with no localized moments. For Mn in Re, this increase corresponds to about ${10}^{-2\mathrm{}}$ emu per mole of solute.