CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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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 |
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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.
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Received: 29 March 2011
Revised: 27 October 2011
Accepted manuscript online:
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PACS:
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75.30.Ds
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(Spin waves)
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74.25.Dw
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(Superconductivity phase diagrams)
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74.20.Mn
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(Nonconventional mechanisms)
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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
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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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