Critical behavior of susceptibility at the nuclear ordering transition in PrCu6

The nuclear susceptibility and magnetization of a Van Vleck paramagnet PrCu 6 have been measured through the nuclear ordering transition. At zero magne tic field, the susceptibility shows a critical behavior at the transition t emperature of 2 mK. This critical behavior shrinks and disappears as the ap plied magnetic field is increased. It is found that this behavior of the su sceptibility is consistent with the electrical resistivity anomaly near the transition in its frequency and magnetic field dependence. The magnetizati on in magnetic fields shows a ferromagnetic increase at the transition, whi ch coincides with the resistivity decrease in the ordered state. [S0031-900 7(98)08321-5].