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Temperature-dependent correlations in covalent insulators: Dynamical mean-field approximation

机译:共价绝缘子中温度相关的关系:动态平均场近似

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摘要

Motivated by the peculiar behavior of FeSi and FeSb_2, we study the effect of local electronic correlations on magnetic, transport, and optical properties in a specific type of band insulator, namely a covalent insulator. Investigating a minimum model of covalent insulator within a single-site dynamical mean-field approximation, we are able to obtain the crossover from low-temperature nonmagnetic insulator to high-temperature paramagnetic metal with parameters realistic for FeSi and FeSb_2 systems. Our results show that the behavior of FeSi does not imply microscopic description in terms of Kondo insulator (periodic Anderson model) as can be often found in the literature, but in fact reflects generic properties of a broader class of materials.
机译:受FeSi和FeSb_2特殊行为的影响,我们研究了特定类型的带绝缘子(即共价绝缘子)中局部电子相关对磁,输运和光学性质的影响。通过研究单点动态平均场近似中的共价绝缘子的最小模型,我们能够获得从低温非磁性绝缘子到高温顺磁性金属的过渡,其参数对于FeSi和FeSb_2系统是现实的。我们的结果表明,FeSi的行为并不意味着可以用文献中经常发现的近藤绝缘子(周期安德森模型)进行微观描述,但实际上反映了更广泛材料类别的通用特性。

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