Abstract
U(Ni,Rh)Al alloys crystallize in the hexagonal ZrNiAl structure. Here, we report on measurements on a single crystalline member of this series, namely, UNi0.39Rh0.61Al. Similar to other members of this series, this compound exhibits highly anisotropic properties with the easy-magnetization direction along the c-axis. We report in the results of electrical resistance, magnetoresistance, and thermal expansion as a function of temperature (2–300K) and applied magnetic field (0–18T). The results provide strong evidence for antiferromagnetic ordering at TN⩽15K followed by a ferromagneticlike (ferro—or ferrimagnetic) transition around 7K (we use the term “ferromagneticlike” because, based on our bulk data, we cannot exclude canted moments with antiferromagnetic components or ferromagnetic order of two different moments). A magnetic B-T phase diagram for UNi0.39Rh0.61Al is proposed.
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