Optical Selection Rules and Magnon Assignments for the Low Temperature Magnetic Spin Structures of CsCoCl3 and CsNiCl3
William B. Euler, Barry B. Garrett, Journal of Physics and Chemistry of Solids, 1981, 42, 13 – 18
Abstract
The optical selection rules for excitons, magnons, and exciton-magnon coupled modes are derived for the various phases of CsCoCl3 and CsNiCl3. For CsCoCl3, these selection rules are used in conjunction with the energy levels calculated in the previous paper (I) to account for the sharp side bands observed in the optical spectrum. For CsNiCl3, the discussion focuses on the utility of the selection rules to be used as a tool to distinguish phases, paticularly in the region of the controversial intermediate phase.