科研之友
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摘要
Considering certain interesting features in the previously reported 166 Er Mossbauer effect, and neutron diffraction data on the polycrystalline form of ErPd2Si2 crystallizing in the ThCr2Si2-type tetragonal structure, we have carried out magnetic measurements (1.8-300 K) on the single crystalline form of this compound. We observe significant anisotropy in the absolute values of magnetization (indicating that the easy axis is c-axis) as well as in features due to magnetic ordering in the plot of magnetic susceptibility chi versus temperature T at low temperatures. The chi(T) data reveal that there is a pseudo-low-dimensional magnetic order setting in at 4.8 K, with a three-dimensional antiferromagnetic order setting in at a lower temperature (3.8 K). A new finding in the chi(T) data is that, for H parallel to [1 1 0] but not for H parallel to [ 0 01], there is a broad shoulder in the range 8-20 K, indicative of the existence of magnetic correlations above 5K as well, which could be related to the previously reported slow-relaxation-dominated Mossbauer spectra. Interestingly, the temperature coefficient of electrical resistivity is found to be isotropic; no feature due to magnetic ordering could be detected in the electrical resistivity data at low temperatures, which is attributed to magnetic Brillioun-zone boundary gap effects. The results reveal the complex nature of magnetism of this compound.
- 出版日期2008-4
- 单位西北工业大学
