Browsing by Author "Mathieu, R."

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Orbital ordering of layered manganites from resonant soft X-ray scattering
(2007-03-01)
Chao, K. S.
;
Huang, D. J.
;
Okamoto, J.
;
Lin, H.-J.
;
Hsu, C.-H.
We present measurements of Mn L-edge resonant soft X-ray scattering on single-layered manganites with different sizes of cations. Orbital ordering of Pr0.5Ca1.5MnO4 exhibits a stronger three-dimensional character and a dramatically enhanced transition temperature, as compared with those of La0.5Sr1.5MnO4. The c-axis correlation length of orbital ordering in Pr0.5Ca1.5MnO4 is about half of the inplane correlation length. Our results indicate that reduction in one-electron bandwidth and quenched disorder strongly enhances the stabilization of charge-orbital ordering. (c) 2006 Published by Elsevier B. V.