Evidence for a Low-Spin to Intermediate-Spin State Transition in LaCoO3

Details Evidence for a Low-Spin to Intermediate-Spin State Transition in LaCoO3 Evidence for a Low-Spin to Intermediate-Spin State Transition in LaCoO3

2002-05-23

arxiv.org/abs/cond-mat/0205479v2

Phys. Rev. B 66, 020402(R) (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

an error in the scaling factor of Eq.(4) and consequently 2 values of table I have been corrected. The conclusions of the pape

Scientific paper

10.1103/PhysRevB.66.020402

We present measurements of the magnetic susceptibility and of the thermal expansion of a LaCoO$_3$ single crystal. Both quantities show a strongly anomalous temperature dependence. Our data are consistently described in terms of a spin-state transition of the Co$^{3+}$ ions with increasing temperature from a low-spin ground state to an intermediate-spin state without (100K - 500K) and with (>500K) orbital degeneracy. We attribute the lack of orbital degeneracy up to 500K to (probably local) Jahn-Teller distortions of the CoO$_6$ octahedra. A strong reduction or disappearance of the Jahn-Teller distortions seems to arise from the insulator-to-metal transition around 500 K.

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