Anomalous Magnetic Phase Diagrams of HoB2C2. Antiferroquadrupolar Ordering in the Magnetic Phase.
Anomalous Magnetic Phase Diagrams of HoB2C2. Antiferroquadrupolar Ordering in the Magnetic Phase.
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HoB2C2 的反常磁相图。
DOI：
10.1143/jpsj.68.2526
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发表时间：
1999
影响因子：
1.7
通讯作者：
Y. Yamaguchi
中科院分区：
文献类型：
--
作者：
H. Onodera;H. Yamauchi;Y. Yamaguchi
研究了单晶四方相HoB2C2化合物的磁性.在5.8K时发生反铁磁性相变，在5.0K时发生一级自旋重取向相变，并沿a轴和[1+1+0]轴发生自发磁化。5.0K以下的磁化过程比反铁四极有序化合物DyB2C2的磁化过程要小得多，并通过假设类似于DyB2C2的磁结构得到了很好的解释。5.0K以下的相是反铁磁性和反铁四极有序竞争共存的相。结果表明，反铁四极有序相发生在反铁磁相变温度以下，只有在磁场中才存在沿[1+1+0]轴的纯反铁四极有序相。
Magnetic properties of the single-crystalline tetragonal HoB 2 C 2 compound were investigated. An antiferromagnetic transition occurs at 5.8 K. At 5.0 K, a spin-reorientation transition of the first order occurs, and spontaneous magnetizations appear along the a - and [1 1 0]-axes. Magnetization processes below 5.0 K are well scaled down from those of the antiferroquadrupolar ordering compound DyB 2 C 2 and are well interpreted by postulating the magnetic structure similar to that of DyB 2 C 2 . The phase below 5.0 K is the one with competitive coexistence of the antiferromagnetic and antiferroquadrupolar order. The result implies that the antiferroquadrupolar ordering transition occurs below the antiferromagnetic transition temperature and that a pure antiferroquadrupolar ordered phase only in the magnetic fields exists along the [1 1 0]-axis.