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arXiv 0802.3660cond-mat.str-elcond-mat.mtrl-sci
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从从头算电子结构计算强关联体系中磁序的起始:应用于过渡金属氧化物

Onset of Magnetic Order in Strongly-Correlated Systems from ab initio Electronic Structure Calculations: Application to Transition Metal Oxides

I. D. Hughes, M. Daene, A. Ernst, W. Hergert, M. Lueders, J. B. Staunton, Z. Szotek, W. M. Temmerman

摘要:

本文描述了强关联电子系统有限温度磁性的从头算理论。该方法基于自旋密度泛函理论,采用自相互作用修正的局域自旋密度近似(SIC-LSDA)。在KKR多重散射方法中,自相互作用校正在局部实现。热致磁波动处理使用平均场的“无序局部矩”(DLM)的方法,并在任何阶段是有一个有效的海森堡模型拟合。我们将该理论应用于3D过渡金属氧化物,在那里我们的计算再现了实验的有序趋势,以及在有序温度的定性趋势。我们发现在顺磁状态下,几乎不随磁序的开始而改变的大的绝缘间隙。

英文摘要:

We describe an ab initio theory of finite temperature magnetism in strongly-correlated electron systems. The formalism is based on spin density functional theory, with a self-interaction corrected local spin density approximation (SIC-LSDA). The self-interaction correction is implemented locally, within the KKR multiple-scattering method. Thermally induced magnetic fluctuations are treated using a mean-field `disordered local moment' (DLM) approach and at no stage is there a fitting to an effective Heisenberg model. We apply the theory to the 3d transition metal oxides, where our calculations reproduce the experimental ordering tendencies, as well as the qualitative trend in ordering temperatures. We find a large insulating gap in the paramagnetic state which hardly changes with the onset of magnetic order.

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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