A different look at the spin state of Co${}^{3+}$ ions in CoO${}_5$ pyramidal coordination

Abstract

Using soft-x-ray absorption spectroscopy at the Co-$L_{2,3}$ and O-$K$ edges, we demonstrate that the Co${}^{3+}$ ions with the CoO${}_5$ pyramidal coordination in the layered Sr${}_2$CoO${}_3$Cl compound are unambiguously in the high spin state. Our result questions the reliability of the spin state assignments made so far for the recently synthesized layered cobalt perovskites, and calls for a re-examination of the modeling for the complex and fascinating properties of these new materials.

5 pages 3 figures

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• Selective Spin-State Switch and Metal-Insulator Transition in \boldmath $\mathrm{GdBaC}{\mathrm{o}}_2{\mathrm{O}}_{5.5}$
• Ising-like Spin Anisotropy and Competing Antiferromagnetic - Ferromagnetic Orders in GdBaCo_{2}O_{5.5} Single Crystals
• Magnetic Structures of High Temperature Phases of TbBaCo2O5.5
• Spin state and phase competition in TbBaCo_{2}O_{5.5} and the lanthanide series LnBaCo_{2}O_{5+δ} (0<=δ<=1)
• Charge and Orbital Ordering and Spin State Transition Driven by Structural Distortion in YBaCo_2O_5
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