Two-Magnon Resonant Raman Scattering in MnF2

Abstract
Resonant Raman scattering in MnF2 around the magnon sidebands selects a particular set of two-magnon modes to be resonantly enhanced. Consequently, the two-magnon line shifts with the laser frequency and two two-magnon lines can show up simultaneously. A simple theory is used to interpret the experimental results.