X-ray absorption and x-ray magnetic dichroism study on Ca3CoRhO6 and Ca3FeRhO6

T. Burnus, Z. Hu, Hua Wu, J. C. Cezar, S. Niitaka, H. Takagi, C. F. Chang, N. B. Brookes, H.-J. Lin, L. Y. Jang, A. Tanaka, K. S. Liang, C. T. Chen, and L. H. Tjeng
Phys. Rev. B 77, 205111 – Published 14 May 2008

Abstract

By using x-ray absorption spectroscopy at the RhL2,3, CoL2,3, and FeL2,3 edges, we find a valence state of Co2+/Rh4+ in Ca3CoRhO6 and of Fe3+/Rh3+ in Ca3FeRhO6. X-ray magnetic circular dichroism spectroscopy at the CoL2,3 edge of Ca3CoRhO6 reveals a giant orbital moment of about 1.7μB, which can be attributed to the occupation of the minority-spin d0d2 orbital state of the high-spin Co2+ (3d7) ions in trigonal prismatic coordination. This active role of the spin-orbit coupling explains the strong magnetocrystalline anisotropy and Ising-type magnetism of Ca3CoRhO6.

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  • Received 3 March 2008

DOI:https://doi.org/10.1103/PhysRevB.77.205111

©2008 American Physical Society

Authors & Affiliations

T. Burnus1, Z. Hu1, Hua Wu1, J. C. Cezar2, S. Niitaka3,4, H. Takagi3,4,5, C. F. Chang1, N. B. Brookes2, H.-J. Lin6, L. Y. Jang6, A. Tanaka7, K. S. Liang6, C. T. Chen6, and L. H. Tjeng1

  • 1II. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, 50937 Köln, Germany
  • 2European Synchrotron Radiation Facility, Boîte Postale 220, 38043 Grenoble, France
  • 3Institute of Physical and Chemical Research, RIKEN, 2-1, Hirosawa, Wako, Saitama 351-0198, Japan
  • 4CREST, Japan Science and Technology Agency (JST), Kawaguchi, Saitama 332-0012, Japan
  • 5Department of Advanced Materials Science, University of Tokyo, 5-1-5, Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
  • 6National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu 30077, Taiwan
  • 7Department of Quantum Matter, ADSM, Hiroshima University, Higashi-Hiroshima 739-8530, Japan

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Vol. 77, Iss. 20 — 15 May 2008

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