EXCITON LINES IN RARE-EARTH ORTHOCHROMITES
Résumé
The exciton lines arising from the Cr3+ R-line of the Gx-type antiferromagnet YCrO3 are studied in magnetic fields up to 50 kOe parallel to the a axis. The polarization of the high field spectrum is consistent with the selection rule for the Gz-type antiferromagnet, indicating a field-induced spin reorientation from Gx to Gz. Other evidences supporting the spin reorientation are also discussed. In DyCrO3 (Gz-type) four exciton lines are clearly observed when a magnetic field is applied along the b-axis. Peculiar properties of these exciton lines are discussed in terms of the antisymmetric Cr3+-Dy 3+ interaction.
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