Pressure-induced intermediate-to-low spin state transition in LaCoO3

Joseph Hriljac, T Vogt, NC Hyatt, PM Woodward

Research output: Contribution to journalArticle

151 Citations (Scopus)


Synchrotron x-ray powder-diffraction experiments reveal that the transition from a magnetic intermediate spin (IS) state t(2g)(5)e(g)(1) to a nonmagnetic low-spin ground state t(2g)(6) in LaCoO3 normally observed when cooling manifests itself under pressure by an anomalously low bulk modulus of 150(2) GPa and an initially very large Co-O bond compressibility of 4.8x10(-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.
Original languageEnglish
Pages (from-to)140410
Number of pages1
JournalPhysical Review B
Issue number14
Publication statusPublished - 1 Apr 2003


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