EXCITON LINES IN RARE-EARTH ORTHOCHROMITES

S. Sugano , Y. Uesaka , I. Tsujikawa , K. Aoyagi , K. Tsushima

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.

Domaines: Articles anciens

S. Sugano, Y. Uesaka, I. Tsujikawa, K. Aoyagi, K. Tsushima. EXCITON LINES IN RARE-EARTH ORTHOCHROMITES. Journal de Physique Colloques, 1971, 32 (C1), pp.C1-798-C1-800. ⟨10.1051/jphyscol:19711281⟩. ⟨jpa-00214118⟩