Visible absorption spectrum of at a temperature of . The sample is thick.
A segment of the optical absorption spectrum of in the region of the optical transition at different temperatures. The sample is thick.
The energies of the pure exciton line (●) and of the peak in the exciton-magnon band (○) as functions of temperature. The inset shows the temperature dependence of .
Absorption spectra of in an external magnetic field directed along the easy magnetization axis z. .
The energies of the split components of the exciton line as functions of applied magnetic field strength for different angles of the field to the easy axis z (●—0°; x—5°). .
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