X-ray absorption and x-ray magnetic dichroism study on Ca 3 CoRhO 6 and Ca 3 FeRhO 6

作者：T. Burnus, Zhiwei Hu, Hua Wu, J. C. Cezar, Seiji Niitaka, H. Takagi, C. F. Chang, Nicholas B. Brookes, Hong Ji Lin, Ling‐Yun Jang, Arata Tanaka, K. S. Liang, Chunlin Chen, Liu Hao Tjeng · 发表于：Physical Review B · 年份：2008 · DOI：10.1103/physrevb.77.205111 · 被引用次数：116 · 研究领域：Advanced Condensed Matter Physics、Magnetic and transport properties of perovskites and related materials、Magnetism in coordination complexes

By using x-ray absorption spectroscopy at the $\text{Rh}\text{ }{L}_{2,3}$, $\text{Co}\text{ }{L}_{2,3}$, and $\text{Fe}\text{ }{L}_{2,3}$ edges, we find a valence state of ${\text{Co}}^{2+}/{\text{Rh}}^{4+}$ in ${\text{Ca}}_{3}{\text{CoRhO}}_{6}$ and of ${\text{Fe}}^{3+}/{\text{Rh}}^{3+}$ in ${\text{Ca}}_{3}{\text{FeRhO}}_{6}$. X-ray magnetic circular dichroism spectroscopy at the $\text{Co}\text{ }{L}_{2,3}$ edge of ${\text{Ca}}_{3}{\text{CoRhO}}_{6}$ reveals a giant orbital moment of about $1.7{\ensuremath{\mu}}_{B}$, which can be attributed to the occupation of the minority-spin ${d}_{0}{d}_{2}$ orbital state of the high-spin ${\text{Co}}^{2+}$ $(3{d}^{7})$ ions in trigonal prismatic coordination. This active role of the spin-orbit coupling explains the strong magnetocrystalline anisotropy and Ising-type magnetism of ${\text{Ca}}_{3}{\text{CoRhO}}_{6}$.