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
TL;DR
This study uses x-ray absorption and dichroism spectroscopy to determine valence states and magnetic properties of Ca3CoRhO6 and Ca3FeRhO6, revealing a giant orbital moment and spin-orbit coupling effects.
Contribution
It provides detailed valence and magnetic characterization of Ca3CoRhO6 and Ca3FeRhO6, highlighting the role of spin-orbit coupling in their magnetic anisotropy.
Findings
Ca3CoRhO6 has Co^2+/Rh^4+ valence states.
Ca3FeRhO6 has Fe^3+/Rh^3+ valence states.
Ca3CoRhO6 exhibits a giant orbital moment of about 1.7μ_B.
Abstract
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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Taxonomy
TopicsAdvanced Condensed Matter Physics · NMR spectroscopy and applications · Geoscience and Mining Technology