Investigation of inversion of the energy levels of the Tb3+ ion in an iron garnet in strong fields using the Faraday effect
Valiev U.V. , Krinchik G.S. , Levitin R.Z., Mukimov K.M.
A jump of the Faraday effect in a terbium-yttrium iron garnet was observed in ~ 80-kOe fields at helium temperatures. This jump is accounted for by a model for inversion of the energy levels of the Tb3 + ion in a magnetic field.