Effect of spin rotation on theA24→E2optical-exciton absorption spectrum ofCr2O3

Abstract

Experimental data showing how the positions, intensities, and polarizations of the $^{4}A_{2}\ensuremath{\rightarrow}^{2}E$ optical exciton absorptions in ${\mathrm{Cr}}_{2}$${\mathrm{O}}_{3}$ change as spin rotation occurs are presented. Differences between the data reported here and data reported previously by Stager are pointed out and discussed. A qualitative interpretation of the observed behavior is given and it is conjectured that most of the spin-rotation effects arise from changes in the role of spin-orbit coupling as the spins rotate. A change in the assignments of some of the exciton lines is suggested.