High-order Ho multipoles in HoB2C2 observed with soft resonant x-ray diffraction
High-order Ho multipoles in HoB2C2 observed with soft resonant x-ray diffraction
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用软共振 X 射线衍射观察到 HoB2C2 中的高阶 Ho 多极子
DOI：
10.1088/0953-8984/24/7/075602
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
et al
中科院分区：
文献类型：
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作者：
A.J.Princep;et al
利用软共振X射线布拉格衍射（SRXD）研究了HoB 2C 2的磁有序相和轨道有序相的Ho 4f多极子。对两个不同方位角处的σ和π入射X射线的能量依赖性的完整描述，以及作为选择能量的方位角的函数的比率I σ/I π，允许确定秩1（偶极）到6（六边形四极）的高阶多极矩。已估计的Ho 4f多极矩，表明占主导地位的十六极（秩4）的顺序与几乎可以忽略不计的影响，无论是偶极或八极磁条款。该分析结合了原子内的磁性和四极相互作用之间的3d核心和4f价壳层，以及干扰的散射下表现不同的时间反转的贡献。SRXD、中子衍射和非共振X射线衍射的比较表明，磁序参数和四极序参数是不同的。的
Soft resonant x-ray Bragg diffraction (SRXD) at the Ho M 4, 5 edges has been used to study Ho 4f multipoles in the combined magnetic and orbitally ordered phase of HoB 2 C 2. A full description of the energy dependence for both σ and π incident x-rays at two different azimuthal angles, as well as the ratio I σ/I π as a function of azimuthal angle for a selection of energies, allows a determination of the higher order multipole moments of rank 1 (dipole) to 6 (hexacontatetrapole). The Ho 4f multipole moments have been estimated, indicating a dominant hexadecapole (rank 4) order with an almost negligible influence from either the dipole or the octupole magnetic terms. The analysis incorporates both the intra-atomic magnetic and quadrupolar interactions between the 3d core and 4f valence shells as well as the interference of contributions to the scattering that behave differently under time reversal. Comparison of SRXD, neutron diffraction and non-resonant x-ray diffraction shows that the magnetic and quadrupolar order parameters are distinct. The