Unified treatment of theory on magnetic properties of FeGe and FeSi
Unified treatment of theory on magnetic properties of FeGe and FeSi
复制标题
FeGe和FeSi磁性能理论的统一处理
DOI：
10.1103/physrevb.93.045125
复制
发表时间：
2016
影响因子：
3.7
通讯作者：
Y. Yanagi and K. Ueda
中科院分区：
文献类型：
--
作者：
Y. Yanagi and K. Ueda
在第一性原理计算得到的实际模型的基础上，统一研究了FeGe和FeSi的磁性能。我们可以发现，随着温度的降低，FeGe发生顺磁性金属态向铁磁性金属态的转变，而FeSi从顺磁性金属态向顺磁性绝缘体态的转变是一个连续的交叉，与实验结果一致。结果表明，FeGe和FeSi的不同磁性行为是由有效带宽控制的电子相关效应强度的差异引起的。
The magnetic properties of FeGe and FeSi are studied in a unified way on the basis of the realistic model derived from the first principle calculations. We can show that, with decreasing the temperature, the transition from the paramagnetic metallic state to the ferromagnetic metallic state takes place for FeGe, while the transition of FeSi from the paramagnetic metal to the paramagnetic insulator is a continuous crossover, consistent with experiments. It is shown that the distinct magnetic behaviors in FeGe and FeSi are attributed to the difference of the strength of the electron correlation effects, controlled by the effective bandwidth.