Magnetic ordering effects upon the optical spectra of rare earth compounds have been investigated in the molecular field approximation.
The shifts and splittings of absorption lines of DAG below the Neel temperature are interpreted in terms of magnetic interactions between the Dy
3+ ions and the finite shifts above TN are attributed to the presence of magnetic short-range order.
A triplet structure of the absorption lines of DyAIO
3 is interpreted as arising from an interaction with two nearest neighbor Dy
3+ ions along the crystal
c-axis. The absorption spectra of DyAIO
3 measured as a function of the external field show evidence for metamagnetic transition.
The exciton-magnon excitations (magnon-sidebands) and the co-operative optical excitation in the rare earth compounds are also discussed.
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