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We report the magnetic field dependence of the dc susceptibility and resistivity in superconducting single crystals of the hexagonal heavy-fermion superconductor UNi 2 Al 3. From the susceptibility we derive a crystalline-electric-field scheme, which closely resembles that of UPd 2 Al 3. Furthermore, we examine the magnetic phase transition into the incommensurably ordered state at T N = 4.1 K and construct the magnetic phase diagram for the three crystallographic directions. While for fields B parallel to the a-or c-axis T N is monotonically lowered, this is not the case for B b. Instead, here we find a field-induced magnetic transition into a, presumably, commensurate ordered magnetic state. We discuss our results on UNi 2 Al 3 in comparison to those for the related system UPd 2 Al 3 .

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Magnetic behavior of the heavy-fermion system UPd2Ga3Sullow, S.; Becker, B.; Nieuwenhuys, G.J.; Menovsky, A.A.; Mydosh, J.A.