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Phys. Rev. B 67, 224423 (2003) [5 pages]

Evidence for orbital ordering in LaCoO3

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G. Maris1, Y. Ren2, V. Volotchaev1, C. Zobel3, T. Lorenz3, and T. T. M. Palstra1,*
1Solid State Chemistry Laboratory, Materials Science Centre, University of Groningen, Nijenborg 4, 9747 AG Groningen, The Netherlands
2Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA
3II. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, 50937 Köln, Germany

Received 7 April 2003; published 18 June 2003

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 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.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.67.224423
DOI:
10.1103/PhysRevB.67.224423
PACS:
61.50.Ks, 61.10.Nz, 71.70.Ej

*Corresponding author. Email address: palstra@chem.rug.nl

 
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