Magnetic phase diagrams of UNiGe

UNiGe undergoes two magnetic transitions in zero field. Here, the magnetic diagrams of UNiGe for B‖b and B‖c are reported. We performed temperature scans of the magnetization in static magnetic fields up to 19.5 T applied along the b and c axes. For both orientations three magnetic phases have been identified in the B–T diagrams. We confirmed the previously reported phase boundaries for B‖c, and in addition we determined the location of the phase boundaries for B‖b. We discuss a possible relationship of the two zero-field antiferromagnetic phases (commensurate: T<42 K; incommensurate: 42 K<T<50 K) and the field-induced phase, which at low temperatures, occurs between 18 and 25 T or 4 and 10 T for B‖b or B‖c, respectively. Finally, we discuss the field dependence of the electronic contribution γ to the specific heat for B‖c up to 17.5 T, and we find that its field dependence is similar to the one found in more itinerant uranium compounds.