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American Physical Society, Physical review B, 20(77)

DOI: 10.1103/physrevb.77.205111

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X-ray absorption and x-ray magnetic dichroism study onCa3CoRhO6andCa3FeRhO6

Journal article published in 2008 by T. Burnus, Z. Hu, Hua Wu, J. C. Cezar, S. Niitaka, H. Takagi, C. F. Chang ORCID, N. B. Brookes, H.-J. Lin, L. Y. Jang, A. Tanaka, K. S. Liang, C. T. Chen, L. H. Tjeng
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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 Co(2+)/Rh(4+) in Ca(3)CoRhO(6) and of Fe(3+)/Rh(3+) in Ca(3)FeRhO(6). X-ray magnetic circular dichroism spectroscopy at the Co L(2,3) edge of Ca(3)CoRhO(6) reveals a giant orbital moment of about 1.7 mu(B), which can be attributed to the occupation of the minority-spin d(0)d(2) orbital state of the high-spin Co(2+) (3d(7)) ions in trigonal prismatic coordination. This active role of the spin-orbit coupling explains the strong magnetocrystalline anisotropy and Ising-type magnetism of Ca(3)CoRhO(6).