Electronic properties of single crystalline UNi$_{0.39}$Rh$_{0.61}$Al
ORAL
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 UNi$_{0.39}$Rh$_{0.61}$Al. 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 (2-300 K) and applied magnetic field (0-18 T). The results provide strong evidence for antiferromagnetic ordering at T$_{N} \le $ 15 K followed by a ferromagnetic transition around 7 K. A magnetic B-T phase diagram for UNi$_{0.39}$Rh$_{0.61}$Al is proposed.
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