Abstract
Linear magnetic birefringence (LMB or the Cotton–Mouton effect) measurements have been performed on single crystals of erbium iron garnet (ErIG) in the 4.2–300-K temperature range at 1.15 μm wavelength in magnetic fields up to 20 kOe, applied along the three cubic crystallographic directions. Light propagation was parallel to the [1̄10] direction. Except for the [110] direction at low temperatures the LMB is proportional to the internal field, and a strong anisotropy is observed in the whole temperature range. At the compensation temperature (80 K) the ‘‘LMB susceptibilities’’ change sign and are found to be proportional to the inverse of the temperature square in a wide range of temperatures. A macroscopic analysis is presented in terms of electric dipole contributions: Thesecond-order magneto-optical coefficient of the Er3+ is deduced in the spontaneous state.
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