期刊
PHYSICAL REVIEW B
卷 83, 期 22, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.83.220515
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资金
- CAS
- MOST of China
- NSFC
- US DOE BES [DE-FG02-05ER46202]
- US DOE, Division of Scientific User Facilities
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 = (+/- 0.5, +/- 0.5) 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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