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We consider nonreciprocal optical effects in classical N\'eel antiferromagnets, where the purely macroscopic electrodynamics does not provide any rotation. The nonzero result appears as a correction linear in the scattering theory parameter a/λ, atomic distance over wavelength. The recent experiment on Cr₂{O}₃$, where optical nonreciprocity already exists with the macroscopic approach, is also discussed.
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Dzyaloshinskiǐ et al. (1995) studied this question.
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