论文标题
磁电材料Ni3Teo6中的交换性记录和电荷不成比例的证据
Evidence of exchange-striction and charge disproportionation in the magneto-electric material Ni3TeO6
论文作者
论文摘要
通过基于温度依赖性同步加速器的粉末X射线衍射和X射线吸收光谱在15至300 K之间研究了手性磁电气Ni3Teo6。我们的工作直接证明了围绕材料的直接证据证明围绕材料的材料，围绕同步性抗固定抗抗性抗体式和Magneto-Magneto-phasase phasase phases。边缘光谱和X射线光电子光谱附近的X射线吸收表明，该样品由晶格中的Ni2+和Ni3+离子均组成。发现Ni的离子状态非常健壮，并且在很大程度上独立于制备途径。此外，发现少数TE4+状态与多数TE6+状态共存，这可能是由于Ni和TE ICH之间的电荷不成比例（Ni2++ TE6+ - > Ni3++ TE4+）。该系统中每个Ni原子的总磁矩矩量也证实了观察到的Ni的混合价值。金属离子和交换截图中的这种混合价值可能归因于系统中观察到的磁电效应。
The chiral magneto-electric compound Ni3TeO6 is investigated through temperature-dependent synchrotron-based powder x-ray diffraction and x-ray absorption spectroscopy between 15 to 300 K. Our work provides direct evidence for the exchange-striction in the material around the concomitant onset point of collinear antiferromagnetic and magneto-electric phases. The x-ray absorption near edge spectra and x-ray photoelectron spectra show that the sample consists of both Ni2+ and Ni3+ ions in the lattice. The ionic state of Ni is found to be quite robust, and it is largely independent of the preparation route. Additionally, the minority Te4+ state is found to coexist with the majority Te6+ state, which may arise from the charge disproportionation between Ni and Te ions (Ni2+ + Te6+ --> Ni3+ + Te4+). The observed mixed valency of Ni is also confirmed by the total paramagnetic moment per Ni atom in the system. This mixed valency in the metal ions and the exchange-striction may be attributed to the observed magneto-electric effect in the system.
