Spin waves in the block checkerboard antiferromagnetic phase

doi:10.1088/1674-1056/21/2/027502

中国物理B ›› 2012, Vol. 21 ›› Issue (2): 27502-027502.doi: 10.1088/1674-1056/21/2/027502

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

卢峰,戴希

收稿日期:2011-03-29 修回日期:2011-10-27 出版日期:2012-01-30 发布日期:2012-01-30
通讯作者: 卢峰,lufeng_china@126.com E-mail:lufeng_china@126.com

Spin waves in the block checkerboard antiferromagnetic phase

Lu Feng(卢峰)^† and Dai Xi(戴希)

Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

Received:2011-03-29 Revised:2011-10-27 Online:2012-01-30 Published:2012-01-30
Contact: Lu Feng,lufeng_china@126.com E-mail:lufeng_china@126.com
Supported by:
Project supported by the Science Foundation for Post-Doctorate Research from the Ministry of Science and Technology of China (Grant No. 20100470589), the National Basic Research Program of China (Grant No. 2007CB925000), and the National Natural Science Foundation of China (Grant No. 51071032).

摘要/Abstract

Abstract: Motivated by the discovery of a new family of 122 iron-based superconductors, we present the theoretical results on the ground state phase diagram, spin wave, and dynamic structure factor obtained from the extended J₁-J₂ Heisenberg model. In the reasonable physical parameter region of K₂Fe₄Se₅, we find that the block checkerboard antiferromagnetic order phase is stable. There are two acoustic spin wave branches and six optical spin wave branches in the block checkerboard antiferromagnetic phase, which have analytic expressions at the high-symmetry points. To further compare the experimental data on neutron scattering, we investigate the saddlepoint structure of the magnetic excitation spectrum and the inelastic neutron scattering pattern based on linear spin wave theory.

Key words: spin wave, phase diagram, superconductivity

中图分类号: (Spin waves)

75.30.Ds

74.25.Dw (Superconductivity phase diagrams) 74.20.Mn (Nonconventional mechanisms)

卢峰,戴希. [J]. 中国物理B, 2012, 21(2): 27502-027502.

Lu Feng(卢峰) and Dai Xi(戴希) . Spin waves in the block checkerboard antiferromagnetic phase[J]. Chin. Phys. B, 2012, 21(2): 27502-027502.

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Spin waves in the block checkerboard antiferromagnetic phase

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