Magnetic measurements on PuxY1-xSb single crystals are reported. PuSb order
s ferromagnetically at 4.2 K, whereas YSb is a weak temperature-independent
paramagnet. Both, T-N and T-C decrease linearly with increasing Y concentr
ation. They are zero for x > 0.18 and x > 0.34, respectively. The magnetic
axis changes from < 100 > in PuSb to < 111 > in the more diluted samples. T
he ordered moments drop drastically to almost zero for x < 0.6. (C) 1999 El
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