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Using soft x-ray absorption spectroscopy and magnetic circular dichroism atthe Co-$L_{2,3}$ edge we reveal that the spin state transition in LaCoO$_{3}$can be well described by a low-spin ground state and a triply-degeneratehigh-spin first excited state. From the temperature dependence of the spectrallineshapes we find that LaCoO$_{3}$ at finite temperatures is an inhomogeneousmixed-spin-state system. Crucial is that the magnetic circular dichroism signalin the paramagnetic state carries a large orbital momentum. This directly showsthat the currently accepted low-/intermediate-spin picture is at variance.Parameters derived from these spectroscopies fully explain existing magneticsusceptibility, electron spin resonance and inelastic neutron data

physical review letters

Spin State Transition in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>LaCoO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>Studied Using Soft X-ray Absorption Spectroscopy and Magnetic Circular Dichroism

Spin State Transition inLaCoO3Studied Using Soft X-ray Absorption Spectroscopy and Magnetic Circular Dichroism