Interplay between charge, orbital and magnetic order in Pr1-xCaxMnO3
M. v. Zimmermann, J. P. Hill, Doon Gibbs, M. Blume, D. Casa, B. Keimer, Y. Murakami, Y. Tomioka, Y. Tokura
Abstract
We report resonant x-ray scattering studies of charge and orbital order in Pr1-xCaxMnO3 with x=0.4 and 0.5. Below the ordering temperature, TO=245 K, the charge and orbital order intensities follow the same temperature dependence, including an increase at the antiferromagnetic ordering temperature, TN. High resolution measurements reveal, however, that long range orbital order is never achieved. Rather, an orbital domain state is formed. Above TO, the charge order fluctuations are more highly correlated than the orbital fluctuations. Similar phenomenology is observed in a magnetic field. We conclude that the charge order drives the orbital order at the transition.
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