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Charge and orbital ordering behaviors in the half doped bi-layered compoundLaSr2Mn2O7 have been studied by resonant and non-resonant X-ray scattering.Three different order parameters, which correspond to the A-typeantiferromagnetic, a charge and an orbital ordered states, were observed bymeasuring the magnetostriction and the superlattice peaks characterized bywavevectors (1/2 1/2 0) and (1/4 1/4 0), respectively. The superlatticereflections indicating the charge and orbital ordered states were observedbelow 210 K. Both the intensities reach a maximum at 160 K on cooling andbecome very weak below 100 K. The peak width of the charge ordered state agreeswith that of the orbital ordered state at all temperatures studied. Theseresults indicate that both the states originate from a single phase and thatthe charge/orbital ordered islands with definite interfaces disperse in theA-type antiferromagnetic phase. The dimensionality of the charge/orbitalordered phase is discussed using this model.Comment: 9pages, 10 figure

Resonant X-ray Study on the Bi-Layered Perovskite Mn Oxide LaSr2Mn2O7

Resonant X-ray Study on the Bi-Layered Perovskite Mn Oxide LaSr₂Mn₂O₇