The form and origin of orbital ordering in the electronic nematic phase of iron-based superconductors

The form and origin of orbital ordering in the electronic nematic phase of iron-based superconductors
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铁基超导体电子向列相轨道有序的形式和起源

DOI:
10.1088/0953-8984/27/10/105702
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发表时间:
2014-02
期刊:
Journal of Physics: Condensed Matter
影响因子:
--
通讯作者:
Li, Tao
Li, Tao
中科院分区:
其他
文献类型:
--
作者:
Su, Yuehua;Liao, Haijun;Li, Tao

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我们通过对实际五波段模型的群理论分析,研究了铁基超导体电子向列相的轨道有序形式。我们发现轨道阶可以是轨道间s波或轨道内d波。通过与现有的ARPES带分裂测量结果的比较,我们发现122系统的轨道有序主要由轨道内的d波分量主导,而111系统的轨道有序主要由轨道间的s波分量主导。我们发现在系统的自旋相关中,两种形式的轨道序都与向列性有强烈的纠缠。发现当(π, 0)和(0,π)有序模式之间的简并被轨道有序模式解除时,磁性有序相的凝聚能显著提高(超过20%)。我们认为在电子向列相中X = (π, 0)和Y = (0, π)点周围的电子口袋上可能的赝隙的大小和散射率应该有很大的不同。我们认为这可能是电阻率测量中观察到的向列性的一个来源。
We investigated the form of orbital ordering in the electronic nematic phase of iron-based superconductors by applying a group theoretical analysis on a realistic five-band model. We find the orbital order can be either of the inter-orbital s-wave form or intra-orbital d-wave form. From the comparison with existing ARPES measurements of band splitting, we find the orbital ordering in the 122 system is dominated by an intra-orbital d-wave component, while that of the 111 system is dominated by an inter-orbital s-wave component. We find both forms of orbital order are strongly entangled with the nematicity in the spin correlation of the system. The condensation energy of the magnetic ordered phase is found to be significantly improved (by more than 20%) when the degeneracy between the (π, 0) and (0, π) ordering pattern is lifted by the orbital order. We argue there should be a large difference in both the scattering rate and the size of the possible pseudogap on the electron pocket around the X = (π, 0) and Y = (0, π) point in the electronic nematic phase. We propose this as a possible origin for the observed nematicity in resistivity measurements.
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