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

T. Burnus,¹ Z. Hu,¹ Hua Wu,¹ J. C. Cezar,² S. Niitaka,^3,4 H. Takagi,^3,4,5 C. F. Chang,¹ N. B. Brookes,² H.-J. Lin,⁶ L. Y. Jang,⁶ A. Tanaka,⁷ K. S. Liang,⁶ C. T. Chen,⁶ and L. H. Tjeng¹

¹ II. Physikalisches Institut, Universität zu Köln, Zülpicher Straße 77, 50937 Köln, Germany
² European Synchrotron Radiation Facility, BP 220, 38043 Grenoble CEDEX, France
³ Institute of Physical and Chemical Research, RIKEN, 2-1, Hirosawa, Wako, Saitama 351-0198, Japan
⁴ CREST, Japan Science and Technology Agency (JST), Kawaguchi, Saitama 332-0012, Japan
⁵ Department 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 30076, Taiwan
⁷Department of Quantum Matter, ADSM, Hiroshima University, Higashi-Hiroshima 739-8530, Japan

[Abstract][References]

• Physical Review B 77, 205111 (2008) (Received 3 March 2008; revised 9 April 2008; published 14 May 2008; 6 pages)
• OAI: arXiv:0803.0293 (3 March 2008)
• Local copy of the PRB (PDF, 341 KiB)

Abstract

By using x-ray absorption spectroscopy at the Rh-L_2,3, Co-L_2,3, and Fe-L_2,3 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 Co-L_2,3 edge of Ca₃CoRhO₆ reveals a giant orbital moment of about 1.7μ_B, 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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