A different look at the spin state of Co$^{3+}$ ions in CoO$_{5}$ pyramidal coordination

Details A different look at the spin state of Co$^{3+}$ ions in CoO$_{5}$ pyramidal coordination A different look at the spin state of Co$^{3+}$ ions in CoO$_{5}$ pyramidal coordination

2003-10-07

arxiv.org/abs/cond-mat/0310138v1

Phys. Rev. Lett. 92, 207402 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages 3 figures

Scientific paper

10.1103/PhysRevLett.92.207402

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.

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