Magnetic anisotropy of single-crystalline

Abstract

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