arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2201.04213cond-mat.mtrl-sci
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通过线性响应形式化方法高通量确定过渡金属氧化物的Hubbard U和Hund J值

High-throughput determination of Hubbard U and Hund J values for transition metal oxides via linear response formalism

Guy C. Moore, Matthew K. Horton, Alexander M. Ganose, Martin Siron, Edward Linscott, David D. O'Regan, Kristin A. Persson

AI总结:

本研究开发自动化atomate工作流,通过线性响应方法对2000多种过渡金属氧化物高通量计算Hubbard U和Hund J值,并验证了其对LiNiPO4磁结构和晶格参数计算的显著改进。

摘要:

DFT+U为传统近似密度泛函理论(DFT)描述关联电子态时产生的自相互作用误差(SIE)提供了一种便捷且高性价比的校正方法。DFT+U(+J)计算的成功取决于其Hubbard U和Hund J参数的准确确定,而线性响应(LR)方法已被证明在计算这些参数时具有计算有效性和准确性。本研究对包含2000多种磁性过渡金属氧化物(TMOs)代表性集合中的过渡金属d电子态的U和J值进行了高通量计算分析,为使用DFT+U研究过渡金属氧化物的研究人员提供了参考框架。为了开展这项高通量研究,开发了一个atomate工作流,用于在大规模并行超级计算架构上自动计算U和J值。为了展示该工作流的应用,使用计算得到的Ni-d和O-p态的Hubbard U和Hund J值,计算了多铁橄榄石LiNiPO4的自旋倾斜磁结构和晶胞参数,并与实验进行了比较。Ni-d的U和J校正均对Ni磁矩倾斜角有强烈影响。此外,包含O-p U值使得计算出的晶格参数与实验结果的一致性显著提高。

英文摘要:

DFT+U provides a convenient, cost-effective correction for the self-interaction error (SIE) that arises when describing correlated electronic states using conventional approximate density functional theory (DFT). The success of a DFT+U(+J) calculation hinges on the accurate determination of its Hubbard U and Hund's J parameters, and the linear response (LR) methodology has proven to be computationally effective and accurate for calculating these parameters. This study provides a high-throughput computational analysis of the U and J values for transition metal d-electron states in a representative set of over 2000 magnetic transition metal oxides (TMOs), providing a frame of reference for researchers who use DFT+U to study transition metal oxides. In order to perform this high-throughput study, an atomate workflow is developed for calculating U and J values automatically on massively parallel supercomputing architectures. To demonstrate an application of this workflow, the spin-canting magnetic structure and unit cell parameters of the multiferroic olivine LiNiPO4 are calculated using the computed Hubbard U and Hund J values for Ni-d and O-p states, and are compared with experiment. Both the Ni-d U and J corrections have a strong effect on the Ni-moment canting angle. Additionally, including a O-p U value results in a significantly improved agreement between the computed lattice parameters and experiment.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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