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Journal Article

Spin-state-driven metal-insulator transition in (La,Sr)CoO3 under high-pressure

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Lengsdorf, R., Rueff, J.-P., Vanko, G., Lorenz, T., Tjeng, L. H., & Abd-Elmeguid, M. M. (2007). Spin-state-driven metal-insulator transition in (La,Sr)CoO3 under high-pressure. Physical Review B, 75(18): 180401, pp. 1-4. doi:10.1103/PhysRevB.75.180401.

Cite as: http://hdl.handle.net/11858/00-001M-0000-0019-0EF2-5
Using Co K beta x-ray emission spectroscopy (XES) we have investigated the effect of pressure on the Co spin state of a single crystal of metallic, ferromagnetic La0.82Sr0.18CoO3. The analysis of the XES spectra up to 14.4 GPa at 300 and 34 K clearly shows a gradual pressure-induced spin-state transition from a high- or intermediate-spin to a low-spin state. These results provide microscopic evidence that the recently observed pressure-induced metal-insulator transition in (La,Sr)CoO3 is driven by a simultaneous spin-state transition. We further show that under high pressures the low-spin state is relatively stable against temperature, in contrast to that in the LaCoO3 case. This is attributed to an enhancement of the crystal field splitting at high pressures.