Evidence for orbital ordering in LaCoO3

Details Evidence for orbital ordering in LaCoO3 Evidence for orbital ordering in LaCoO3

2003-04-29

arxiv.org/abs/cond-mat/0304651v1

Physics

Condensed Matter

Strongly Correlated Electrons

Accepted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.67.224423

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 state (S=1) of LaCoO3. The alternation of short and long bonds in the ab plane indicates the presence of eg orbital ordering induced by a cooperative Jahn-Teller distortion. We observe an increase of the Jahn-Teller distortion with temperature in agreement with a thermally activated behavior of the Co3+ ions from a low-spin ground state to an intermediate-spin excited state.

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