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arXiv 2401.00864cond-mat.mtrl-sci
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在Hubbard修正密度泛函理论框架下预测UO2的磁态:一种自洽方法

Prediction of Magnetic State of UO2 within Hubbard-corrected Density-Functional Theory: A self-consistent approach

Mahmoud Payami

AI总结:

本研究基于密度泛函微扰理论,自洽计算了UO2在铁磁与反铁磁构型下的Hubbard参数和基态能量,从理论上证实其基态为反铁磁,填补了该系统能量稳定磁态理论研究的空白。

摘要:

UO$_2$的磁态经实验确定为反铁磁。基于此实验事实,研究人员在Hubbard修正密度泛函理论(DFT+U)框架内计算了其他性质。迄今为止,UO$_2$的Hubbard参数通常被选择以使计算结果与某些实验数据相符。此外,据我们所知,尚无关于该系统能量稳定磁态的有效理论研究报告。在本工作中,采用基于密度泛函微扰理论的新方法,我们自洽地确定了UO$_2$晶体在铁磁和反铁磁两种构型下的Hubbard参数和基态能量,计算结果表明UO$_2$晶体在能量上倾向于反铁磁态,且能量差很小。在所有计算中,交换关联能泛函均采用PBE-sol近似。

英文摘要:

The magnetic state of UO$_2$ was determined experimentally to be anti-ferromagnetic. Starting from this experimental fact, researchers have calculated other properties within the Hubbard-corrected density-functional theory, DFT+U. Up to now, the Hubbard parameters for UO$_2$ were usually so chosen that the calculations give good results for some experimental data. Also, to our knowledge there exists no valid theoretical research report on the energetically stable magnetic state of this system. In present work, employing the new method which is based on density-functional perturbation theory, we have determined self-consistently the Hubbard parameters and ground-state energies for UO$_2$ crystal in both ferromagnetic and anti-ferromagnetic configurations, and the calculated results show that UO$_2$ crystal energetically favors an anti-ferromagnetic state with a small energy difference. In all the calculations the PBE-sol approximation was used for the exchange-correlation energy functional.

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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