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The spin excitations of the block-antiferromagnetic K$_{0.8}$Fe$_{1.6}$Se$_2$

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arxiv 1103.3884 v1 pith:L3IC34TL submitted 2011-03-20 cond-mat.supr-con

Yi-Zhuang You , Hong Yao , Dung-Hai Lee This is my paper · ORCID
classification cond-mat.supr-con
keywords spinexcitationsblock-antiferromagneticopticalwaveadditionanalogatom
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abstract

We study the spin excitations of the newly discovered block-antiferromagnetic state in K$_{0.8}$Fe$_{1.6}$Se$_2$ using an effective spin Hamiltonian suggested in the literature. Interestingly in addition to the usual Goldstone mode, there exists three other "optical" spin wave branches. These spin excitations are the analog of "optical phonons" in crystals with more than one atom per unit cell. We compute the spin wave corrected ordering moment and the uniform spin susceptibilities.

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