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arXiv 1705.04550cond-mat.str-el
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Sr PDMATHAAB Co $_{0.5}$ Ir $_{0.5}$ O $_4$中Co $^{3+}$自旋态的复杂性:X射线吸收和磁性圆二色性研究

Intricacies of the Co$^{3+}$ spin state in Sr$_2$Co$_{0.5}$Ir$_{0.5}$O$_4$: an x-ray absorption and magnetic circular dichroism study

S. Agrestini, C. -Y. Kuo, D. Mikhailova, K. Chen, P. Ohresser, T. W. Pi, H. Guo, A. C. Komarek, A. Tanaka, Z. Hu, L. H. Tjeng

摘要:

我们报告了一个结合软X射线吸收和磁性圆二色性(XMCD)的研究在Co- $L_{3,2}$的混合3 $d$ /5 $d$固态氧化物Sr $_2$ Co $_{0.5}$ Ir $_{0.5}$ O $_4$与K $_2$ NiF $_4$结构。我们的数据明确地表明,尽管CoO $_6$八面体有相当大的伸长,但Co $^{3+}$(3 $d^6$)离子的纯高自旋态$(S=2)$具有显着的未猝灭轨道矩$L_z/2S_z=0.25$。使用定量模型计算与我们的光谱参数一致的基础上,我们已经调查了这种高自旋态的稳定性相对于竞争的低自旋和中间自旋状态。

英文摘要:

We report on a combined soft x-ray absorption and magnetic circular dichroism (XMCD) study at the Co-$L_{3,2}$ on the hybrid 3$d$/5$d$ solid state oxide Sr$_2$Co$_{0.5}$Ir$_{0.5}$O$_4$ with the K$_2$NiF$_4$ structure. Our data indicate unambiguously a pure high spin state $(S=2)$ for the Co$^{3+}$ (3$d^6$) ions with a significant unquenched orbital moment $L_z/2S_z=0.25$ despite the sizeable elongation of the CoO$_6$ octahedra. Using quantitative model calculations based on parameters consistent with our spectra, we have investigated the stability of this high spin state with respect to the competing low spin and intermediate spin states.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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