The hexagonal uranium intermetallic compound ${\mathrm{UNi}}_4$B orders antiferromagnetically below ${\mathit{T}}_{\mathit{N}}$=20 K in a magnetic structure, where, in zero applied magnetic field, one-third of the spins remains paramagnetic. Here, we report on the high-field (B≤50 T) magnetic and transport properties of this material. We establish the magnetic structures and phase diagram and the influence of magnetic field on the paramagnetic spins. Model calculations of the magnetization assuming two independent spin systems are in qualitative agreement with the observed magnetization.

• Received 16 November 1994

DOI:https://doi.org/10.1103/PhysRevB.51.11567