Different Look at the Spin State of Co3+ Ions in a CoO5 Pyramidal Coordination

Z. Hu, Hua Wu, M. W. Haverkort, H. H. Hsieh, H. -J. Lin, T. Lorenz, J. Baier, A. Reichl, I. Bonn, C. Felser, A. Tanaka, C. T. Chen, and L. H. Tjeng
Phys. Rev. Lett. 92, 207402 – Published 20 May 2004

Abstract

Using soft-x-ray absorption spectroscopy at the Co L2,3 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 reexamination of the modeling for the complex and fascinating properties of these new materials.

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  • Received 23 September 2003

DOI:https://doi.org/10.1103/PhysRevLett.92.207402

©2004 American Physical Society

Authors & Affiliations

Z. Hu1, Hua Wu2, M. W. Haverkort1, H. H. Hsieh3, H. -J. Lin3, T. Lorenz1, J. Baier1, A. Reichl1, I. Bonn4, C. Felser4, A. Tanaka5, C. T. Chen3, and L. H. Tjeng1,*

  • 1II. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, 50937 Köln, Germany
  • 2Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Strasse 38, 01187 Dresden, Germany
  • 3National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu 30077, Taiwan
  • 4Johannes Gutenberg-Universität Mainz, Becher Wege 24, 55099 Mainz, Germany
  • 5Department of Quantum Matters, ADSM, Hiroshima University, Higashi-Hiroshima 739-8530, Japan

  • *Corresponding author.

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Issue

Vol. 92, Iss. 20 — 21 May 2004

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