Abstract
Spectral change of the exciton absorption lines in YCrO 3 observed during the field-induced spin reorientation (SR) is investigated. The energy shift of the center of gravity of the four exciton lines during the SR is calculated. It is shown that the change of the spin-orbit coupling energy during the SR plays an important role in the energy shift. The change of the observed total intensities of the exciton lines in each polarization in the whole range of the SR is calculated by taking into account the tilting of the CrO 6 octahedron from the undistorted perovskite structure. The result is in fair agreement with experiments. Finally the energy transfer matrix elements are determined from the moments of the observed energies and intensities by choosing appropriately the phases of the basic wavefunctions.
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