On the possible ferromagnetism in divalent boride-systems
On the possible ferromagnetism in divalent boride-systems
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关于二价硼化物系统中可能的铁磁性
DOI：
10.1103/physrevb.65.184421
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
M. Ogata
中科院分区：
文献类型：
--
作者：
C. Hotta;H. Fukuyama;M. Ogata
本文从理论上研究了二价硼化物系统铁磁基态的可能性，考虑了实际的三维结构，其中三对价带和导带在X点重叠。研究表明，由于在位库仑相互作用和交换相互作用之间的特殊关系，即使在平均场计算中，金属铁磁性也很难稳定。另一方面，铁磁金属被认为是更容易稳定在一对半金属带的模型，这表明铁磁性的四对称性的偏好。同时，对激子铁磁性也作了评论。
The possibility of ferromagnetic ground states of divalent boride systems has been theoretically investigated by taking into account realistic three-dimensional structures with three pairs of valence and conduction bands which overlap at the X points. It is indicated that because of the particular relationships between on-site Coulomb and exchange interactions, metallic ferromagnetism is difficult to stabilize even within a mean-field calculation. On the other hand, the ferromagnetic metal is seen to be more easily stabilized in the model of a single pair of semimetallic bands, suggesting the preference of tetragonal symmetry for ferromagnetism. Also, a comment is made against excitonic ferromagnetism.