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 (11)

• Structural phenomena associated with the spin-state transition in LaCoO3
• Evidence for a Low-Spin to Intermediate-Spin State Transition in LaCoO3
• Evidence for orbital ordering in LaCoO3
• A different look at the spin state of Co${}^{3+}$ ions in CoO${}_5$ pyramidal coordination
• Pressure-Induced Intermediate-to-Low Spin State Transition in LaCoO3
• Controlling orbital moment and spin orientation in CoO layers by strain
• Nano-magnetic droplets and implications to orbital ordering in La1-xSrxCoO3
• The influence of the rare earth ions radii on the Low Spin to Intermediate Spin state transition in lanthanide cobaltite perovskites: LaCoO3 vs. HoCoO3
• The 5D term origin of the excited triplet in LaCoO3
• Itinerant metamagnetism and possible spin transition in LaCoO${}_3$ by temperature/hole doping
• Spin transition in LaCoO3 investigated by resonant soft X-ray emission spectroscopy

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