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The spin excitations of the block-antiferromagnetic K_(0.8)Fe_(1.6)Se₂

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

The spin excitations of the block-antiferromagnetic K_(0.8)Fe_(1.6)Se₂

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