论文标题
α-Rucl3中的极性磁和化学键
Polar magnetism and chemical bond in alpha-RuCl3
论文作者
论文摘要
三氯化丁酸是许多最近的实验和理论研究的主题。约翰逊等。从在无缠绕的α-Rucl3样本上收集的结果中，从收集的结果中推断出磁性结构（CC2/M）的候选者[R. D. Johnson等人，物理。 Rev. B 92，235119（2015）]。提出的锯齿形抗铁磁基态的RU离子对散装磁探针没有反应。候选磁性结构的特性先前未探索，包括支持Ru Dirac Multipors的极性磁性，例如ruthenium anapole。在一般情况下，狄拉克偶极子能够在磁离子之间产生相互作用，例如在电dzyaloshinskii-moryia相互作用中[T. A. Kaplan和S. D. Mahanti，物理。 Rev. B 83，174432（2011）和H. J. Zhao等人，Nat。垫。 20，341（2021）]。狄拉克多极有助于X射线和中子的衍射，以及对磁性结构CC2/M的严格测试，等待未来的实验。从对称性信息计算中，我们表明，磁性候选者允许仅由狄拉克多物产生的bragg点。 CC2/M的严格测试也可以通过从氯K-边缘增强的信号增强的谐振X射线衍射来完成。针对α-Rucl3发表的X射线吸收光谱具有显着的低能功能[K.。 W. Plumb等人，物理。 Rev. B 90，041112（R）（2014）]。对其他Cl-金属化合物的许多实验研究得出结论，相同的特征标志着化学键。使用单斜型CC2/M结构，我们预测Cl K边缘吸收时对Bragg衍射的贡献。具体而言，在反射矢量旋转的布拉格斑点强度的变化。我们研究的两个主要主题，极性磁性和α-Rucl3中的化学键，在CC2/m的磁性ru离子的最小模型中汇集在一起。
Ruthenium trichloride is the subject of many recent experimental and theoretical studies. Johnson et al. infer a candidate for the magnetic structure (Cc2/m) from results gathered in an extensive set of experiments on an untwined sample of alpha-RuCl3 [R. D. Johnson et al., Phys. Rev. B 92, 235119 (2015)]. The proposed zigzag antiferromagnetic ground state of Ru ions does not respond to bulk magnetic probes. Properties of the candidate magnetic structure not previously explored include polar magnetism that supports Ru Dirac multipoles, e.g., a ruthenium anapole. In a general case, Dirac dipoles are capable of generating interactions between magnetic ions, as in an electrical Dzyaloshinskii-Moryia interaction [T. A. Kaplan and S. D. Mahanti, Phys. Rev. B 83, 174432 (2011) and H. J. Zhao et al., Nat. Mat. 20, 341 (2021)]. Dirac multipoles contribute to the diffraction of both x-rays and neutrons, and a stringent test of the magnetic structure Cc2/m awaits future experiments. From symmetry-informed calculations we show that, the magnetic candidate permits Bragg spots that arise solely from Dirac multipoles. Stringent tests of Cc2/m can also be accomplished by performing resonant x-ray diffraction with signal enhancement from the chlorine K-edge. X-ray absorption spectra published for alpha-RuCl3 possess a significant low-energy feature [K. W. Plumb et al., Phys. Rev. B 90, 041112(R) (2014)]. Many experimental studies of other Cl-metal compounds concluded that identical features hallmark the chemical bond. Using a monoclinic Cc2/m structure, we predict the contribution to Bragg diffraction at the Cl K-edge absorption. Specifically, the variation of intensity of Bragg spots with rotation of the sample about the reflection vector. The two principal topics of our studies, polar magnetism and the chemical bond in alpha-RuCl3, are brought together in a minimal model of magnetic Ru ions in Cc2/m.
