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arxiv: 0803.0293 · v1 · submitted 2008-03-03 · ❄️ cond-mat.str-el

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
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H.-J. Lin L. Y. Jang A. Tanaka K. S. Liang C. T. Chen L. H. Tjeng
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classification ❄️ cond-mat.str-el
keywords ca3corho6x-rayabsorptionca3ferho6co-ldichroismmagneticorbital
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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 Ca3CoRhO6 and of Fe^3+/Rh^3+ in Ca3FeRhO6. X-ray magnetic circular dichroism spectroscopy at the Co-L_2,3 edge of Ca3CoRhO6 reveals a giant orbital moment of about 1.7mu_B, which can be attributed to the occupation of the minority-spin d_0d_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-like magnetism of Ca3CoRhO6.

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