57Fe and 166Er Mössbauer and magnetic studies of RFe4B (R = Er,Tm, Lu) compounds |
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Authors: | PP Vaishnava CW Kimball AM Umarji SK Malik GK Shenoy |
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Institution: | Department of Physics, Northern Illinois University, DeKalb, IL 60115, USA;Argonne National Laboratory, Argonne, IL 60439, USA |
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Abstract: | Magnetic and Mössbauer studies have been carried out on a series of ternary borides RFe4B (R = Er, Tm, Lu) which have the hexagonal CeCo4B type structure. These compounds are found to be magnetically ordered at room temperature. Magnetization studies in the temperature range from 5 to 300 K reveal the presence of compensation temperatures in Er and Tm compounds and indicate antiferromagnetic coupling between the rare earth and Fe moments. Room temperature 57Fe Mössbauer studies yield values of hyperfine fields at the two Fe sites as 246 and 185 kOe in ErFe4B and TmFe4B, and 204 and 145 kOe in LuFe4B. The 166Er Mössbauer studies give nearly free-ion hyperfine field at the Er sites which indicates that the exchange interaction in ErFe4B is much stronger than crystal field interaction. |
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