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

• DOI: 10.1103/physrevb.77.205111
• Publication Date: 2008-05-14T17:34:09Z
• Authors: 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; L. H. Tjeng
• Keywords: Magnetism

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