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arXiv 1902.06217cond-mat.mtrl-sci
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磁序在VOCl中的作用

The role of magnetic order in VOCl

Marcus Ekholm, Andreas Schönleber, Sander van Smaalen

摘要:

VOCl和其他过渡金属氯氧化物是下一代可充电电池的候选材料。利用密度泛函理论研究了磁性有序对晶体结构和电子结构的影响。我们的研究表明,反铁磁有序解释了所观察到的低温单斜晶格畸变,这导致反铁磁耦合的V-V最近邻之间的距离减小。我们还表明,一个本地的磁矩的存在下,删除先前建议的简并的占用水平,与实验一致。为了描述电子结构,关键是要考虑正确的磁序,特别是在高温下。

英文摘要:

VOCl and other transition metal oxychlorides are candidate materials for next-generation rechargeable batteries. We have investigated the influence of the underlying magnetic order on the crystallographic and electronic structure by means of density functional theory. Our study shows that antiferromagnetic ordering explains the observed low-temperature monoclinic distortion of the lattice, which leads to a decreased distance between antiferromagnetically coupled V-V nearest neighbors. We also show that the existence of a local magnetic moment removes the previously suggested degeneracy of the occupied levels, in agreement with experiments. To describe the electronic structure, it turns out crucial to take the correct magnetic ordering into account, especially at elevated temperature.

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