Phys. Rev. B 66, 020402(R) (2002) [4 pages]Evidence for a low-spin to intermediate-spin state transition in LaCoO3See Also: Erratum
We present measurements of the magnetic susceptibility and of the thermal expansion of a LaCoO3 single crystal. Both quantities show a strongly anomalous temperature dependence. Our data are consistently described in terms of a spin-state transition of the Co3+ ions with increasing temperature from a low-spin ground state (t2g6eg0) to an intermediate-spin state (t2g5eg1) without (100–500 K) and with (>500 K) orbital degeneracy. We attribute the lack of orbital degeneracy up to 500 K to (probably local) Jahn-Teller distortions of the CoO6 octahedra. A strong reduction or disappearance of the Jahn-Teller distortions seems to arise from the insulator-to-metal transition around 500 K. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.66.020402
DOI:
10.1103/PhysRevB.66.020402
PACS:
75.80.+q, 65.40.-b
See AlsoErratum: C. Zobel, M. Kriener, D. Bruns, J. Baier, M. Grüninger, T. Lorenz, P. Reutler, and A. Revcolevschi, Erratum: Evidence for a low-spin to intermediate-spin state transition in LaCoO3 [Phys. Rev. B 66, 020402 (R)(2002)], Phys. Rev. B 71, 019902 (2005). |
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