We report results of studies on the magnetic and transport properties of ${\mathrm{CeNiBi}}_2.$ The magnetic susceptibility exhibits a sharp peak at $T_N=6\mathrm{}\mathrm{K},$ indicating an antiferromagnetic phase transition. This antiferromagnetic order below $T_N$ is confirmed by magnetization measurement, which displays a metamagneticlike transition at $H_m=5\mathrm{}\mathrm{T}.$ Both low-temperature susceptibility and high-field magnetization are suggestive of strong crystalline-electric-field effect in ${\mathrm{CeNiBi}}_2.$ The electrical resistivity shows the presence of Kondo and crystal-field effects with a sharp drop below $T_N$ due to the antiferromagnetic ordering. This sharp drop below $T_N$ in the electrical resistivity is suppressed slightly to higher temperatures by an applied magnetic field to 18 T. With increasing magnetic field, the slope of magnetoresistance changes from positive to negative, being indicative of the transition to a field-induced ferromagnetic state.

• Received 22 June 2001

DOI:https://doi.org/10.1103/PhysRevB.65.132405