Magnetic structure and its long-time variation in the multistep metamagnet CeIr_3Si_2
Magnetic structure and its long-time variation in the multistep metamagnet CeIr_3Si_2
复制标题
多级元磁体CeIr_3Si_2的磁结构及其长期变化
DOI：
10.1143/jpsj.81.014704
复制
发表时间：
2011
期刊：
影响因子：
--
通讯作者：
T.Moyoshi
中科院分区：
文献类型：
--
作者：
高橋雅裕;桂法称;甲元眞人;高麗徹;T.Moyoshi
对 CeIr3Si2 单晶进行了中子散射测量，在 TN1=4.1 K 和 TN2=3.3 K 处显示出连续的磁转变。观察到磁结构的长期变化。将样品快速冷却到 TN2 以下后，对应于 TN2<T<TN1 磁相的布拉格峰强度仍然存在，并随着时间的推移而降低。相反，对应于 T<TN2 的磁相的布拉格峰值强度随时间增加。这种变化的特征时间遵循阿累尼乌斯定律，激活能Ea/kB=4 K。给出了a×8b×8canda×3b×3c结构的两个磁相的磁结构模型。在此模型的基础上，讨论了磁结构长期变化的机理。
Neutron scattering measurements have been made on a single crystal of CeIr3Si2which shows successive magnetic transitions atTN1=4.1 K andTN2=3.3 K. A long-time variation in magnetic structure has been observed. After rapidly cooling the sample belowTN2, the intensity of the Bragg peaks corresponding to a magnetic phase atTN2<T<TN1remains and decreases with time. Instead, the Bragg peak intensity corresponding to a magnetic phase atT<TN2increases with time. The characteristic time for this variation follows the Arrhenius law with an activation energyEa/kB=4 K. Magnetic structure models in two magnetic phases witha×8b×8canda×3b×3cstructures are presented. On the basis of these models, the mechanism of long-time variation of magnetic structure is discussed.