Anharmonic magnon excitations in noncollinear and charge-ordered RbFe${}^{2+}$Fe${}^{3+}$F${}_6$

M. Songvilay, E. E. Rodriguez, R. Lindsay +4

RbFe${}^{2+}$Fe${}^{3+}$F${}_6$ is an example of a charge ordered antiferromagnet where iron sites, with differing valences, are structurally separated into two interpenetrating sublatti…