Spin-state-driven metal-insulator transition in (La,Sr) Co O3 under high-pressure

R. Lengsdorf, J. P. Rueff, G. Vankó, T. Lorenz, L. H. Tjeng, M. M. Abd-Elmeguid

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Abstract

Using Co Kβ x-ray emission spectroscopy (XES) we have investigated the effect of pressure on the Co spin state of a single crystal of metallic, ferromagnetic La0.82 Sr0.18 Co O3. 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) Co O3 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 LaCo O3 case. This is attributed to an enhancement of the crystal field splitting at high pressures.

Original languageEnglish
Article number180401
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume75
Issue number18
DOIs
Publication statusPublished - May 15 2007

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Metal insulator transition
insulators
metals
Emission spectroscopy
X rays
spectroscopy
crystal field theory
Single crystals
x rays
Crystals
augmentation
single crystals
Temperature

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Spin-state-driven metal-insulator transition in (La,Sr) Co O3 under high-pressure. / Lengsdorf, R.; Rueff, J. P.; Vankó, G.; Lorenz, T.; Tjeng, L. H.; Abd-Elmeguid, M. M.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 75, No. 18, 180401, 15.05.2007.

Research output: Contribution to journalArticle

Lengsdorf, R. ; Rueff, J. P. ; Vankó, G. ; Lorenz, T. ; Tjeng, L. H. ; Abd-Elmeguid, M. M. / Spin-state-driven metal-insulator transition in (La,Sr) Co O3 under high-pressure. In: Physical Review B - Condensed Matter and Materials Physics. 2007 ; Vol. 75, No. 18.
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AU - Lorenz, T.

AU - Tjeng, L. H.

AU - Abd-Elmeguid, M. M.

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