Pcm. Gubbens et al., INFLUENCE OF THE CRYSTAL-FIELD ON THE MAGNETIC-BEHAVIOR OF ER2NI17, Journal of magnetism and magnetic materials, 144, 1995, pp. 1011-1012
The intermetallic Er2Ni17 was measured by Er-166 Mossbauer spectroscop
y. From the hyperfine field measured at T = 0.6 K we conclude that the
two Er sites have almost pure \ - 15/2> and \ - 13/2>) ground states.
This behaviour can be explained by a different sign of the fourth ord
er crystal field terms.