Fe-57 Mossbauer study in RNiBC compounds (R = Er, Ho, Dy, Tb and Gd)

Fe-57 Mossbauer effect (ME) experiments have been performed on RNiBC (R = E r, Ho, Dy, Tb, Gd) compounds, Below the magnetic ordering temperatures, T-M , the Fe-57 ME spectra show a transferred magnetic hyperfine field at the F e (Ni) site for Tb and Er, but such a field is absent for Ho, Dy and Gd. Th e T-M for RNiBC do not scale linearly with the de Gennes factor, and the cr ystal field effects in the different types of magnetic order of these compo unds may be responsible for this behavior. (C) 2001 Elsevier Science B.V. A ll rights reserved.