A different look at the spin state of Co³⁺ ions in CoO₅ pyramidal coordination

2003/10/07 by Z. Hu, Hua Wu, M. W. Haverkort +10
Physics and Astronomy · #cond-mat.str-el

paper · pdf · doi:10.1103/physrevlett.92.207402

published as Phys. Rev. Lett. 92, 207402 (2004) · 5 pages 3 figures

arxiv created 2003/10/07 · arxiv updated 2009/12/01

Abstract

Using soft-x-ray absorption spectroscopy at the Co-L_2,3 and O-K edges, we demonstrate that the Co³⁺ ions with the CoO₅ pyramidal coordination in the layered Sr₂CoO₃Cl 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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