Magnetic properties of NpSb(0.95)Te(0.05) from 121Sb transferred hyperfine field measurements
Single crystal neutron diffraction measurements performed on NpSb(0.95)Te(0.05) have indicated a complex magnetic behaviour. This report presents a detailed 121Sb Mössbauer study of this compound with particular emphasis on the origin of H(tr)(121Sb) and its temperature dependence. Below 142 K, the Mössbauer spectra do not show any detectable quadrupolar interaction. At saturation, 4.2 K, a relatively large transferred field (263 kG) is observed compared with NpSb (164 kG). Accurate thermal scans around the 90 K ferro-ferri transition show a small anomaly in temperature dependence of H(tr). It is concluded from analysis of the results that the enhanced value of H(tr) in NpSb comes from anisotropic contributions. In the ferrimagnetic state of NpSb(0.95)Te(0.05), these contributions weaken the anticipated anomaly at 90 K. The data also show that H(tr) does not scale with m(T) as deduced from neutron data.
Bibliographic Reference: Paper presented: 22 Journées des Actinides, Méribel (FR), April 22-25, 1992
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Record Number: 199210978 / Last updated on: 1994-12-02
Original language: en
Available languages: en