Charge and Magnetic Order in L${\mathrm{a}}_{0.5}$S${\mathrm{r}}_{1.5}$Mn${\mathrm{O}}_4$

Elastic neutron scattering measurements characterizing the charge and magnetic order in L${\mathrm{a}}_{0.5}$S${\mathrm{r}}_{1.5}$Mn${\mathrm{O}}_4$ are presented. Superlattice reflections corresponding to an alternating ${\mathrm{Mn}}^{+3\mathrm{}}/{\mathrm{Mn}}^{+4\mathrm{}}$ pattern with wave vector ${\mathbf{q}}_{\mathrm{co}}=(\frac{1}{2},\frac{1}{2},0\mathrm{})$ are observed below the charge ordering temperature, $T_{\mathrm{co}}\approx 217$ K. Below the Néel temperature, $T_N\approx 110$ K, the magnetic moments associated with these ions form an ordered structure with dimensions $2\sqrt{2}a\times 2\sqrt{2}a\times 2c$ relative to the underlying chemical cell.