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arXiv 0905.1704cond-mat.str-el
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铁磷属化合物中轨道有序引起的结构相变和电阻率异常

Orbital-Ordering Induces Structural Phase Transition and the Resistivity Anomaly in Iron Pnictides

Weicheng Lv, Jiansheng Wu, Philip Phillips

摘要:

我们属性的结构相变(SPT)的铁pnictides的母体化合物的轨道有序。由于$d_{xz}$和$d_{yz}$轨道在$xy$平面中的各向异性,铁轨道有序化使得正交结构在能量上更有利,从而诱导SPT。在这个轨道有序的系统中,轨道不有序的位置具有更高的能量。这些本地化的两个级别系统的巡回电子的散射引起的电阻率异常的SPT发病后。提出的轨道排序也导致了条纹状的反铁磁性和磁交换的各向异性。该模型与现有的实验观测结果定量一致。

英文摘要:

We attribute the structural phase transition (SPT) in the parent compounds of the iron pnictides to orbital ordering. Due to the anisotropy of the $d_{xz}$ and $d_{yz}$ orbitals in the $xy$ plane, a ferro-orbital ordering makes the orthorhombic structure more energetically favorable, thus inducing the SPT. In this orbital-ordered system, the sites with orbitals that do not order have higher energies. Scattering of the itinerant electrons by these localized two-level systems causes a resistivity anomaly upon the onset of the SPT. The proposed orbital ordering also leads to the stripe-like anti-ferromagnetism and anisotropy of the magnetic exchanges. This model is quantitatively consistent with available experimental observations.

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