Spin waves in the block checkerboard antiferromagnetic phase

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

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.

Keywords: spin wave phase diagram superconductivity

Received: 29 March 2011
Revised: 27 October 2011
Accepted manuscript online:

PACS:	75.30.Ds	(Spin waves)
	74.25.Dw	(Superconductivity phase diagrams)
	74.20.Mn	(Nonconventional mechanisms)

Fund: 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).

Corresponding Authors: Lu Feng,lufeng_china@126.com
E-mail: lufeng_china@126.com

Cite this article:

Lu Feng(卢峰) and Dai Xi(戴希) Spin waves in the block checkerboard antiferromagnetic phase 2012 Chin. Phys. B 21 027502

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Spin waves in the block checkerboard antiferromagnetic phase

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