抄録
The absorption spectrum of DyCrO3 in the red region was studied with and without a magnetic field. From the Zeeman spectrum of a Dy3+ ion, the anisotropy axis of a Dy3+ ion was determined to be directed along the axis deviated by ±30° from the b-axis in the ab-plane. The magnitudes of the excitation transfer between the Cr3+ ions with parallel spin (0.25 cm−1) and with antiparallel spin (0 cm−1) were obtained by analyzing the exciton lines associated with the Cr3+ t2g3 4A2g→t2g3 2Eg transition. Remarkable shifts of the exciton lines were observed in magnetic fields parallel to the b-axis. Magnetic-field dependence of these shifts indicated that they were induced by some Dy3+-Cr3+ interaction. An electric-dipole line creating a Cr3+ exciton and a Dy3+ spin flip was also observed, from which a negative dispersion of the Cr3+ exciton was found to be at least −16 cm−1.
