Bond electronic polarization induced by spin
Bond electronic polarization induced by spin
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DOI：
10.1103/physrevb.74.224444
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发表时间：
2006-12-01
影响因子：
3.7
通讯作者：
Han, Jung Hoon
中科院分区：
文献类型：
--
作者：
Jia, Chenglong;Onoda, Shigeki;Han, Jung Hoon
本文从理论上研究了强Hund耦合极限下非共线自旋组态诱导的极化。我们采用两个磁性离子包围一个氧离子的模型。结果表明，沿键存在一个纵向极化P-x沿着，它大致与（m（r）（x））（2）-（m（l）（x））（2）成正比，其中m（r（l））（x）是右（左）磁离子自旋取向矢量的x分量。模型哈密顿量的数值研究产生纵向和横向电偶极矩。横向极化被证明是有一个不均匀的，以及一个均匀的组件，与后者是与以前的理论相一致。纵向极化是不均匀的，并且以自旋阶的一半周期振荡，但是局部幅度通常比均匀横向极化大得多，并且可以通过X射线/中子散射实验检测到。
We study theoretically the electric polarization induced by noncollinear spin configurations in the limit of strong Hund coupling. We employ a model of two magnetic ions sandwiching an oxygen ion. It is shown that there appears a longitudinal polarization P-x along the bond, which is roughly proportional to (m(r)(x))(2)-(m(l)(x))(2) where m(r(l))(x) is the x component of the spin orientation vector at right (left) magnetic ion. A numerical study of the model Hamiltonian yields both longitudinal and transverse electric dipole moments. The transverse polarization is shown to have a nonuniform as well as a uniform component, with the latter being consistent with the previous theory. The longitudinal polarization is nonuniform and oscillating with the period half that of the spin order, but the local magnitude is typically much larger than the uniform transverse polarization and may be detected by x-ray/neutron scattering experiments.