Pressure-Induced Intermediate-to-Low Spin State Transition in LaCoO3

Details Pressure-Induced Intermediate-to-Low Spin State Transition in LaCoO3 Pressure-Induced Intermediate-to-Low Spin State Transition in LaCoO3

2002-10-31

arxiv.org/abs/cond-mat/0210681v1

Physics

Condensed Matter

Materials Science

3 page, 1 table, 4 figures

Scientific paper

10.1103/PhysRevB.67.140401

Synchrotron X-ray powder diffraction experiments reveal that the transition from a magnetic intermediate spin (IS) state to a nonmagnetic low-spin (LS) ground state in LaCoO3 normally observed when cooling, manifests itself under pressure by an anomalously low bulk compressibility of 150(2) GPa and an initially very large bond compressibility of 4.8e-3 GPa-1 which levels off near 4 GPa. The continuous depopulation of the IS state is driven by an increased crystal field splitting resulting in an effective reduction of the size of the Co3+ cation.

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