Antiferroquadrupolar Ordering and Magnetic Properties of the Tetragonal DyB 2C 2 Compound
Antiferroquadrupolar Ordering and Magnetic Properties of the Tetragonal DyB 2C 2 Compound
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四方 DyB 2C 2 化合物的反铁四极有序性和磁性
DOI：
10.1143/jpsj.68.2057
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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. Yamauchi;H. Onodera;K. Ohoyama;T. Onimaru;M. Kosaka;M. Ohashi;Y. Yamaguchi
研究了一种具有四方晶系结构的单晶DyB 2C 2化合物的磁性.在T C =15.3 K以下，自发磁化出现在沿着a-和[110]-方向.在T_Q = 24.7K处，只沿着c轴观察到一个很小的肩，而在T_C和T_Q处观察到大的λ型反常比热。在低于T_C的磁化过程中，在四面体基面上存在着大的磁各向异性。中子粉末衍射实验表明，磁反射只在低于T C时才能观察到。在磁有序相中，Dy矩被布置成垂直于沿沿着c轴的相邻者.通过假定TC和TQ之间的相是反铁四极有序相，很好地解释了这些结果。DyB 2C 2是一种新型化合物，具有较高的反铁四极有序温度（24.7K）.
Magnetic properties were investigated on a single-crystalline DyB 2 C 2 compound with the tetragonal structure. Spontaneous magnetizations appear along the a- and [1 1 0]-directions below T C =15.3 K. A very small shoulder is observed only along the c -axis at T Q =24.7 K, although large λ-type anomalous specific heats are observed at T C and T Q . There exists a large magnetic anisotropy in the tetragonal basal plane which is observed in magnetization processes below T C . Neutron powder diffraction experiments reveal that magnetic reflections are observed only below T C . In the magnetically ordered phase, the Dy moments are arranged to be perpendicular to neighbors along the c -axis. The results are well interpreted by postulating that the phase between T C and T Q is an antiferroquadrupolar ordered one. DyB 2 C 2 is a novel compound with a high antiferroquadrupolar ordering temperature of 24.7 K.