Surface effects on the orbital order in the single layered manganite La0.5 Sr1.5 MnO4
Résumé
We report the first observation of 'orbital truncation rods' - the scattering arising from the termination of bulk orbital order at the surface of a crystal. The x-ray measurements, performed on a cleaved, single-layered perovskite, La0.5 Sr1.5 MnO4 , reveal that while the crystallographic surface is atomically smooth, the orbital 'surface' is much rougher, with an r.m.s. deviation from the average 'surface' of ∼7 A. The temperature dependence of this scattering shows evidence of a surface-induced second order transition.
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