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- W2023687021 abstract "A microscopic description of the mechanism responsible for an absorption line observed in antiferromagnetic Fe${mathrm{F}}_{2}$ at 154 ${mathrm{cm}}^{ensuremath{-}1}$ is proposed. The mechanism appears to account for the properties of the observed line which are described in the preceding paper. In isolating the proposed mechanism, we set up a model which includes magnon, phonon, exciton, and photon fields and their interactions. The mechanism involves an indirect coupling between odd-parity excitons and magnons which we have previously called the odd-exciton-magnon interaction. This coupling is a consequence of the combined action of the spin-orbit interaction and the quadrupole-dipole part of the spin-orbit interaction. A search through fourth order in perturbation theory in this model yields several other possible processes. Our estimates indicate that the process we propose is the largest contributor in Fe${mathrm{F}}_{2}$ and that a third process, involving a phonon, may be contributing to the absorption intensity. The proposed process is used to derive the spin Hamiltonian used in the preceding paper and to estimate the intensity and polarization ratio." @default.
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- W2023687021 date "1966-09-16" @default.
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- W2023687021 title "Microscopic Theory of Far-Infrared Two-Magnon Absorption in Antiferromagnets. I. Perturbation-Theory Search and Application of Fourth-Order Process to Fe<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>F</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>" @default.
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- W2023687021 doi "https://doi.org/10.1103/physrev.149.423" @default.
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