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arXiv 2008.13669cond-mat.mtrl-sci
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基于双极-多极理论的磁性结构从头算预测基准

Benchmark for Ab Initio Prediction of Magnetic Structures based on Cluster-Multipole Theory

Marie-Therese Huebsch, Takuya Nomoto, Michi-To Suzuki, Ryotaro Arita

摘要:

磁结构的簇多极(CMP)展开提供了一种系统地生成候选磁结构的方案,所述候选磁结构具体包括适于给定材料的晶体对称性的非共线磁配置。与MAGNDATA上收集的实验数据的比较表明,自然界中最稳定的磁位形是只有少数几个CMP的线性组合。在自旋密度泛函理论(SDFT)的框架下,对所有候选磁性结构进行了高通量计算.我们用$2935$计算对CMP+SDFT的预测能力进行了基准测试,结果表明:(i)CMP扩展管理了候选磁结构的详尽列表,(ii)CMP+SDFT可以将可能的磁配置缩小到少数计算配置,(iii)SDFT以$\pm0.5\,μ_\text{B}$的精度再现了实验磁配置。对于一个子集,现场库仑排斥$U$的影响进行了研究,通过$1545$ CMP+SDFT+U计算揭示没有进一步改善的预测能力。

英文摘要:

The cluster multipole (CMP) expansion for magnetic structures provides a scheme to systematically generate candidate magnetic structures specifically including noncollinear magnetic configurations adapted to the crystal symmetry of a given material. A comparison with the experimental data collected on MAGNDATA shows that the most stable magnetic configurations in nature are linear combinations of only few CMPs. Furthermore, a high-throughput calculation for all candidate magnetic structures is performed in the framework of spin-density functional theory (SDFT). We benchmark the predictive power of CMP+SDFT with $2935$ calculations, which show that (i) the CMP expansion administers an exhaustive list of candidate magnetic structures, (ii) CMP+SDFT can narrow down the possible magnetic configurations to a handful of computed configurations, and (iii) SDFT reproduces the experimental magnetic configurations with an accuracy of $\pm0.5\,μ_\text{B}$. For a subset the impact of on-site Coulomb repulsion $U$ is investigated by means of $1545$ CMP+SDFT+U calculations revealing no further improvement on the predictive power.

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