Magnetic phase transitions in UPd2Ge2

Magnetic properties of UPd2Ge2 have been studied at 4.2-300 K and in an applied field up to 55 kG. The magnetic state of the compound is different in three temperature regions. At 140 K UPd2Ge2 transforms from para- to antiferromagnetic state, and in Hext=0 the material is antiferromagnetic in the range 140-80 K. The strong field Hext>14 kG can induce a ferromagnetic component in this region. Below 80 K a small ferromagnetic component appears spontaneously, and it is strongly enhanced by the applied field. In the range 80-20 K the magnetic state can be considered as a coexistence of antiferromagnetic and ferromagnetic states, or as a ferrimagnetic state. In high Hext the antiferromagnetic state can be suppressed and ferromagnetic phase dominates. Below 20 K the ferromagnetic component is small and the antiferromagnetic phase dominates. ((orig.))