Metamagnetism and crystal-field splitting in pseudohexagonal CeRh 3 Si 2
Metamagnetism and crystal-field splitting in pseudohexagonal CeRh 3 Si 2
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赝六方 CeRh 3 Si 2 中的超磁性和晶体场分裂
DOI：
10.1103/physrevb.105.125119
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发表时间：
2022
影响因子：
3.7
通讯作者：
Amorese A
中科院分区：
文献类型：
--
作者：
Amorese A
据报道，在5 K以下表现出超磁跃迁，巨大的晶体场分裂，以及单晶磁化和热容测量的各向异性磁性。在这里，我们报告了磁结构和晶体场激发的中子和x射线散射研究结果，以进一步了解该化合物的磁性。非弹性中子散射和共振非弹性x射线散射在考虑晶体学方向为量子化轴的情况下揭示了Ce的基态，从而解释了其静态磁化率的各向异性。此外，我们发现该多极体的总分裂为78 meV。零场中子衍射研究表明，从顺磁状态冷却时，系统一阶纵向自旋密度波具有沿轴（即[0 1 0]晶体方向）有序的Ce矩和不对称的传播矢量。在低温转变下，传播矢量锁定到相应的值，即所谓的锁定转变。我们在应用磁场中的中子衍射研究显示了相应的传播矢量的变化和铁磁分量的发展，随后在达到完全场致铁磁相位之前发生了一系列转变。这解释了先前在场相关磁化测量中报道的步骤的性质。在[0 1 1]晶体方向上也观察到非常相似的行为。
has been reported to exhibit metamagnetic transitions below 5 K, a giant crystal field splitting, and anisotropic magnetic properties from single crystal magnetization and heat capacity measurements. Here we report results of neutron and x-ray scattering studies of the magnetic structure and crystal-field excitations to further understand the magnetism of this compound. Inelastic neutron scattering and resonant inelastic x-ray scattering reveal aground state for Ce when considering the crystallographicdirection as quantization axis, thus explaining the anisotropy of the static susceptibility. Furthermore, we find a total splitting of 78 meV for themultiplet. The neutron diffraction study in zero field reveals that, on cooling from the paramagnetic state, the system first orders atin a longitudinal spin density wave with ordered Ce moments along theaxis (i.e., the [0 1 0] crystal direction) and an incommensurate propagation vector). Below the lower-temperature transition, the propagation vector locks to the commensurate value, with a so-called lock-in transition. Our neutron diffraction study in applied magnetic fieldaxis shows a change in the commensurate propagation vector and development of a ferromagnetic component at, followed by a series of transitions before the fully field-induced ferromagnetic phase is reached at. This explains the nature of the steps previously reported in field-dependent magnetization measurements. A very similar behavior is also observed for the[0 1 1] crystal direction.