X-ray absorption and x-ray magnetic dichroism study on Ca3CoRhO6 and Ca3FeRhO6
X-ray absorption and x-ray magnetic dichroism study on Ca3CoRhO6 and Ca3FeRhO6
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DOI：
10.1103/physrevb.77.205111
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发表时间：
2008-05-01
影响因子：
3.7
通讯作者：
Tjeng, L. H.
中科院分区：
文献类型：
--
作者：
Burnus, T.;Hu, Z.;Tjeng, L. H.
用X射线吸收光谱在Rh L-2，L-3，Co L-2，L-3和Fe L-2，L-3的边缘发现了Ca3CoRhO6中Co2+/Rh4+和Ca3FeRhO6中Fe3+/Rh3+的价态。在Ca3CoRhO6的Co L-2，L-3边的X射线磁性圆二色谱显示了约1.7mU(B)的巨型轨道矩，这可以归因于高自旋Co2+(3d(7))离子在三角配位中占据了少数自旋d(0)d(2)轨道态。这种自旋-轨道耦合的活跃作用解释了Ca3CoRhO6强烈的磁晶各向异性和伊辛型磁性。
By using x-ray absorption spectroscopy at the Rh L-2,L-3, Co L-2,L-3, and Fe L-2,L-3 edges, we find a valence state of Co2+/Rh4+ in Ca3CoRhO6 and of Fe3+/Rh3+ in Ca3FeRhO6. X-ray magnetic circular dichroism spectroscopy at the Co L-2,L-3 edge of Ca3CoRhO6 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 Co2+ (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 Ca3CoRhO6.