Direct measurement of the low-temperature spin-state transition in LaCoO3

R. F. Klie, J. C. Zheng, Y. Zhu, M. Varela, J. Wu, C. Leighton

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Abstract

LaCoO3 exhibits an anomaly in its magnetic susceptibility around 80 K associated with a thermally excited transition of the Co3+-ion spin. We show that electron energy-loss spectroscopy is sensitive to this Co3+-ion spin-state transition, and that the O K edge prepeak provides a direct measure of the Co3+ spin state in LaCoO3 as a function of temperature. Our experimental results are confirmed by first-principles calculations, and we conclude that the thermally excited spin-state transition occurs from a low to an intermediate spin state, which can be distinguished from the high-spin state.

Original languageEnglish (US)
Article number047203
JournalPhysical Review Letters
Volume99
Issue number4
DOIs
StatePublished - Jul 25 2007

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ions
energy dissipation
electron energy
anomalies
magnetic permeability
spectroscopy
temperature

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Direct measurement of the low-temperature spin-state transition in LaCoO3. / Klie, R. F.; Zheng, J. C.; Zhu, Y.; Varela, M.; Wu, J.; Leighton, C.

In: Physical Review Letters, Vol. 99, No. 4, 047203, 25.07.2007.

Research output: Contribution to journalArticle

Klie, R. F. ; Zheng, J. C. ; Zhu, Y. ; Varela, M. ; Wu, J. ; Leighton, C. / Direct measurement of the low-temperature spin-state transition in LaCoO3. In: Physical Review Letters. 2007 ; Vol. 99, No. 4.
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AB - LaCoO3 exhibits an anomaly in its magnetic susceptibility around 80 K associated with a thermally excited transition of the Co3+-ion spin. We show that electron energy-loss spectroscopy is sensitive to this Co3+-ion spin-state transition, and that the O K edge prepeak provides a direct measure of the Co3+ spin state in LaCoO3 as a function of temperature. Our experimental results are confirmed by first-principles calculations, and we conclude that the thermally excited spin-state transition occurs from a low to an intermediate spin state, which can be distinguished from the high-spin state.

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