COMPLEX ANTIFERROMAGNETIC ORDER OF CECUSN

CeCuSn, which forms in the hexagonal CaIn2-type of structure, orders a ntiferromagnetically at 8.6 K. A second maximum at about 7.35 K seen i n the temperature dependence of the specific heat indicates a rearrang ement of the antiferromagnetic structure. The antiferromagnetic orderi ng is also reflected in the temperature dependence of the electrical r esistivity. Upon application of magnetic fields up to 5 T, a complex d evelopment of magnetic phases can be followed by monitoring the temper ature dependencies of the magnetization and the specific heat. In the B-T diagram, three different magnetic phases were detected and their b oundaries could be determined.