Field-induced magnetic ordering in NiCl2 center dot 4SC(NH2)(2)

We have investigated the low-temperature T field-induced ordering in NiCl2.4SC(NH2)(2), from magnetization measurements. This is an S=1 system with a large single-ion uniaxial anisotropy leaving a singlet ground state. An external magnetic field (B) parallel to the symmetry axis induces an antiferromagnetically ordered phase for B-c1