Surface effects on the orbital order in the single layered manganite La0.5Sr1.5MnO4

Details Surface effects on the orbital order in the single layered manganite La0.5Sr1.5MnO4 Surface effects on the orbital order in the single layered manganite La0.5Sr1.5MnO4

2007-06-07

arxiv.org/abs/0706.0939v1

Nature Materials 6, 972 - 976 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

13 pages, 4 figures

Scientific paper

10.1038/nmat2061

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, La0.5Sr1.5MnO4, 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 ~0.7nm. The temperature dependence of this scattering shows evidence of a surface-induced second order transition.

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