Abstract
Magnetic susceptibility χ( T) measurements have been performed on single crystals of PuS, PuSe, and PuTe. For T > 50K χ( T) is independent of T with a small value of ≈300 × 10 -6 emu/mol. For T<50 K increases are seen in χ. We believe these arise because of defects in the lattice. Polarised neutron diffraction has been used to determine the form factor of the 5f electrons around the Pu ion. The largest induced moment is ≈5 × 10 -3μ B so the form factor is not accurately determined, but is clearly different from that found in the localised system PuSb. The results are discussed in terms of our present understanding of the Pu monochalcogenides. A theory consistent with all the present measurements is not yet available.
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