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Evidence for orbital ordering in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">LaCoO</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>
We present powder and single-crystal x-ray diffraction data as evidence for a monoclinic distortion in the low-spin $(S=0)$ and intermediate spin states $(S=1)$ of ${\mathrm{LaCoO}}_{3}.$ The alternation of short and long bonds in the ab plane indicates the presence of ${e}_{g}$ orbital ordering induced by a cooperative Jahn-Teller distortion. We …