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VOLUME 41 (1985) | ISSUE 1 | PAGE 38
Observation of a new light-scattering mechanism in an antiferromagnet
A study of the Brillouin scattering of light in the antiferromagnet EuTe has revealed a previously unobserved light-scattering mechanism that involves an s-f exchange interaction. This interaction causes the refractive index to depend on the magnetization of the crystal. As a result, in a highly skewed antiferromagnet, with a large static magnetization and longitudinal oscillations of the moment, an inelastic scattering of light not accompanied by a rotation of the polarization plane is observed.