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- W1497679426 abstract "We calculate the magnetic excitation spectrum of the J1 − J2 model for iron pnictides within the framework of the nonlinear sigma model. We find, in addition to the usual acoustic spin-wave branch, a second, optical spin-wave branch, not captured by previous theoretical studies. We also find that the spin-wave velocity has a planar directional anisotropy, resulting from the collinear/striped structure of the antiferromagnetic ground state. Finally, we include single ion anisotropy, which fully gaps all branches, and we discuss the relevance of the modified, multi-branched, fully gapped character of the spectrum to the understanding of neutron scattering results for SrFe2As2" @default.
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- W1497679426 date "2012-12-14" @default.
- W1497679426 modified "2023-09-26" @default.
- W1497679426 title "Magnetic spectrum of theJ1−J2model for pnictides" @default.
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- W1497679426 doi "https://doi.org/10.1088/1742-6596/391/1/012139" @default.
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