Calculation of Temperature Dependence of Photoinduced Linear Dichroism in YIG(Si)

Recently it has been proposed by Tucciarone that the relative magnitude of photoinduced dichroism in YIG(Si) can be calculated by imposing axial symmetry on the electric‐dipole photodetachment cross section. By means of this method, the polarization dependence of the dichroism induced by linearly and circularly polarized light was calculated, and, while the former case was found to be uniquely determined by symmetry alone in the framework of the model, the latter effect was found to be particularly sensitive, by means of a “shape parameter” r, to the details of the excitation process. In this paper we apply the same method to the calculation of the temperature dependence of the dichroism induced by both linearly and circularly polarized light. We find that the temperature variation of the magnitude of the dichroism depends on the strength of the trigonal field, while the temperature dependence of the shape parameter r is strongly coupled to the spin‐orbit constant. In case the trigonal field is assigned the values recently proposed by Alben et al., the calculated magnitude of the dichroism is practically constant between 0°K and nitrogen temperature, if the relaxation time of the effect is neglected.