期刊
PHYSICAL REVIEW B
卷 79, 期 18, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.180504
关键词
antiferromagnetic materials; band model of magnetism; band structure; excitons; iron compounds; spin density waves; superconducting materials
We examine the appearance of a spin-density wave in the FeAs parent compounds due to an excitonic instability. Using a realistic four-band model, we show that the magnetic state depends very sensitively on the details of the band structure. We demonstrate that an orthorhombic distortion of the crystal enhances the stability of the antiferromagnetic order.
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