arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1306.6727cond-mat.str-el
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铁磷属元素最小双带模型中轨道序在$(π,0)$有序磁态稳定中的作用

The role of orbital order in the stabilization of the $(π,0)$ ordered magnetic state in a minimal two-band model for iron pnictides

Sayandip Ghosh, Avinash Singh

摘要:

在最小双带巡游电子模型下研究了铁磷属元素化物($π,0$)有序磁态的自旋波激发和稳定性.跳跃各向异性的存在在$d_{xz}$和$d_{yz}$ Fe轨道中产生强铁轨道有序。轨道序号与实验中观察到的一致。诱导的铁轨道顺序强烈地增强了自旋波的能量尺度和稳定的磁性状态,通过优化的强度的紧急AF和F自旋耦合通过最佳的带填充在两个轨道。计算的自旋波色散与中子散射测量定量一致。有限的轨道间Hund耦合被证明是通过耦合两个磁子系统来进一步增强自旋波能态。还考虑了具有较小跳跃各向异性的更现实的两带模型,该模型不仅产生圆孔袋,还产生正确的铁轨道序和涌现的F自旋耦合。

英文摘要:

Spin wave excitations and stability of the ($π,0$) ordered magnetic state are investigated in a minimal two-band itinerant-electron model for iron pnictides. Presence of hopping anisotropy generates a strong ferro-orbital order in the $d_{xz}$ and $d_{yz}$ Fe orbitals. The orbital order sign is as observed in experiments. The induced ferro-orbital order strongly enhances the spin wave energy scale and stabilizes the magnetic state by optimizing the strength of the emergent AF and F spin couplings through optimal band fillings in the two orbitals. The calculated spin-wave dispersion is in quantitative agreement with neutron scattering measurements. Finite inter-orbital Hund's coupling is shown to further enhance the spin wave energies state by coupling the two magnetic sub-systems. A more realistic two-band model with less hopping anisotropy is also considered which yields not only the circular hole pockets, also correct ferro-orbital order and emergent F spin coupling.

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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