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
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.
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