A magnetooptical study of the odd crystal field component in a terbium-yttrium aluminum garnet

We have studied the photoluminescence spectra and the luminescence magnetic circular polarization (LMCP) spectra in the region of the 4f-4f radiative transition 5D4→7F6 in the rare earth Tb3+ ion in a Y3Al5O12 garnet matrix. A comparison of the experimental and theoretically calculated LMCP spectra allowed parameters of the odd crystal field component to be determined that removes the prohibition with respect to parity from the 4f-4f transitions in Tb3+ ion in the garnet structure. The energy spectra and wave functions of 5D4 and 7F6 multiplets of Tb3+ ion in a crystal field with the D2 symmetry have been calculated.