PHASE-DIAGRAM OF THE MAGNETIC HEAVY-FERMION SUPERCONDUCTOR UPD2AL3

The following issues concerning UPd2Al3 are addressed: (i) its anisotr opic magnetic phase diagram which can be explained by domain-reorienta tion effects, (ii) the coexistence between magnetically ordered local 5f moments and Cooper pairs formed by weakly delocalized 5f states and (iii) distinct anomalies in the sample length measured both vs T and B, suggesting a strongly undercooled first-order transition at B (T) less than or similar to B-c2(T) for T < T similar or equal to 0.8 T-c .