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

Abstract 57Fe Mossbauer effect (ME) experiments have been performed on RNiBC (R=Er, Ho, Dy, Tb, Gd) compounds. Below the magnetic ordering temperatures, TM, the 57Fe ME spectra show a transferred magnetic hyperfine field at the Fe (Ni) site for Tb and Er, but such a field is absent for Ho, Dy and Gd. The TM for RNiBC do not scale linearly with the de Gennes factor, and the crystal field effects in the different types of magnetic order of these compounds may be responsible for this behavior.