Soft vibrational mode associated with incommensurate orbital order in multiferroic CaMn${}_7$O${}_{12}$

Xinyu Du, Renliang Yuan, Lian Duan +3

We report inelastic light scattering measurements of lattice dynamics related to the incommensurate orbital order in $\mathrm{CaM}{\mathrm{n}}_7{\mathrm{O}}_{12}$. Below the ordering temperature $T_\mat…