The spin state transition in LaCoO${}_3$; revising a revision

Abstract

Using soft x-ray absorption spectroscopy and magnetic circular dichroism at the 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-degenerate high-spin first excited state. From the temperature dependence of the spectral lineshapes we find that LaCoO${}_3$ at finite temperatures is an inhomogeneous mixed-spin-state system. Crucial is that the magnetic circular dichroism signal in the paramagnetic state carries a large orbital momentum. This directly shows that the currently accepted low-/intermediate-spin picture is at variance. Parameters derived from these spectroscopies fully explain existing magnetic susceptibility, electron spin resonance and inelastic neutron data.

References in corpus (2)

• A different look at the spin state of Co${}^{3+}$ ions in CoO${}_5$ pyramidal coordination
• Controlling orbital moment and spin orientation in CoO layers by strain

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