Charge and Magnetic Order in La0.5Sr1.5MnO4

Elastic neutron scattering measurements characterizing the charge and magnetic order in La0.5Sr1.5MnO4 are presented. Superlattice reflections corresponding to an alternating Mn+3/Mn+4 pattern with wave vector qco=(12,12,0) are observed below the charge ordering temperature, Tco≈217 K. Below the Néel temperature, TN≈110 K, the magnetic moments associated with these ions form an ordered structure with dimensions 22 a×22 a×2c relative to the underlying chemical cell.