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arXiv 1104.3653cond-mat.supr-con
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非超导Li1-xFeAs单晶中的反铁磁自旋激发

Antiferromagnetic spin excitations in single crystals of nonsuperconducting Li1-xFeAs

Meng Wang, X. C. Wang, D. L. Abernathy, L. W. Harriger, H. Q. Luo, Yang Zhao, J. W. Lynn, Q. Q. Liu, C. Q. Jin, Chen Fang, Jiangping Hu, Pengcheng Dai

摘要:

我们使用中子散射,以确定在整个布里渊区的非超导Li 1-xFeAs单晶的自旋激发。虽然角分辨光电发射实验和局域密度近似计算表明反铁磁(AF)秩序的费米面嵌套条件差,自旋激发在Li 1-xFeAs发生在AF波矢量Q =(1,0)在低能量,但移动到波矢量Q =(\pm 0.5,\pm 0.5)附近的区域边界的总磁带宽相媲美的BaFe 2As 2。这些结果表明,AF自旋激发仍然主导着这些材料的低能物理,并建议巡回和强的电子-电子相关性是必不可少的,以了解测量的磁激发。

英文摘要:

We use neutron scattering to determine spin excitations in single crystals of nonsuperconducting Li1-xFeAs throughout the Brillouin zone. Although angle resolved photoemission experiments and local density approximation calculations suggest poor Fermi surface nesting conditions for antiferromagnetic(AF) order, spin excitations in Li1-xFeAs occur at the AF wave vectors Q = (1, 0) at low energies, but move to wave vectors Q = (\pm 0.5, \pm0.5) near the zone boundary with a total magnetic bandwidth comparable to that of BaFe2As2. These results reveal that AF spin excitations still dominate the low-energy physics of these materials and suggest both itinerancy and strong electron-electron correlations are essential to understand the measured magnetic excitations.

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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