Abstract
The temperature-magnetic field ($T\ensuremath{-}H$) phase diagram for the tetragonal compound CeRu${}_{2}$Al${}_{2}$B, determined from magnetization, specific heat, nuclear magnetic resonance (NMR), and electrical resistivity is reported. This system exhibits localized $4f$ magnetic ordering at high temperatures where antiferromagnetism is observed at a N\'eel temperature ${T}_{N}=14.2$ K and a first-order ferromagnetic transition is observed at a Curie temperature ${T}_{C}=12.8$ K. The application of a magnetic field $H$ results in a rich phase diagram that includes three magnetically ordered phases: (1) antiferromagnetic, (2) canted antiferromagnetic, and (3) ferromagnetic, indicating that there are several finely tuned exchange interactions.
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