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Antiferromagnetic spin excitations in single crystals of nonsuperconducting Li1-xFeAs

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arxiv 1104.3653 v2 pith:R7MNOOBK submitted 2011-04-19 cond-mat.supr-con

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
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C. Q. Jin Chen Fang Jiangping Hu Pengcheng Dai
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classification cond-mat.supr-con
keywords excitationsspinli1-xfeasantiferromagneticcrystalsmagneticnonsuperconductingsingle
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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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