| Abstract
| - Oxidation of the ferromagnetic B-site diluted manganese(III) perovskite La2GaMnO6 isinvestigated by synthesis of the La2-xSrxGaMnO6 series. At the x = 0.3 composition, whichcorresponds to diamagnetic element substitution at the B-site of metallic La0.7Sr0.3MnO3,the MnIII and MnIV valences order in real space at low temperature with an unusual lamellarmotif. Orbital ordering at the MnIII centers in this array maintains ferromagnetism andenhances the static coherent Jahn−Teller distortion over that found for the pure MnIII end-member, facilitating eg electron hopping in the insulating state. Further oxidation to x =0.5 completely suppresses the charge and orbital ordering, leading to glassy rather thanlong-range ordered magnetism.
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