Electronic structures of layered perovskite Sr2MO4 (M=Ru, Rh, and IR)
Electronic structures of layered perovskite Sr2MO4 (M=Ru, Rh, and IR)
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DOI：
10.1103/physrevb.74.113104
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发表时间：
2006-07
影响因子：
3.7
通讯作者：
S. Moon;Mi-Lim Kim;K. Kim;Y. Lee;Jae-Sun Kim;J. Park;Beom Jun Kim;Shinyoung Oh;S. Nakatsuji-S
中科院分区：
文献类型：
--
作者：
S. Moon;Mi-Lim Kim;K. Kim;Y. Lee;Jae-Sun Kim;J. Park;Beom Jun Kim;Shinyoung Oh;S. Nakatsuji-S
我们利用光谱和偏振相关的 O 1\textit{s} X 射线吸收光谱研究了二维层状钙钛矿 Sr$_{2}$\textit{M}O$_{4}$ (\textit{M}=4\textit{d} Ru、4\textit{d} Rh 和 5\textit{d} Ir) 的电子结构。虽然这一系列化合物的基态相当不同，但它们的光电导谱 $\sigma(\omega)$ 表现出相似的带间跃迁，表明 4\textit{d} 和 5\textit{d} 层状氧化物的常见电子结构。两个 $e_{g}$ 轨道，$i.e$、$d_{3z^{2}-r^{2}}$ 和 $d_{x^{2}-y^{2}}$ 之间的能量分裂约为 2 eV，比赝立方和 3\textit{d} 层状钙钛矿氧化物中的能量分裂大得多。从晶体结构和4\textit{d}和5\textit{d}轨道的扩展特性讨论了Sr$_{2}$\textit{M}O$_{4}$化合物的电子性质。
We investigated the electronic structures of the two-dimensional layered perovskite Sr$_{2}$\textit{M}O$_{4}$ (\textit{M}=4\textit{d} Ru, 4\textit{d} Rh, and 5\textit{d} Ir) using optical spectroscopy and polarization-dependent O 1\textit{s} x-ray absorption spectroscopy. While the ground states of the series of compounds are rather different, their optical conductivity spectra $\sigma(\omega)$ exhibit similar interband transitions, indicative of the common electronic structures of the 4\textit{d} and 5\textit{d} layered oxides. The energy splittings between the two $e_{g}$ orbitals, $i.e.$, $d_{3z^{2}-r^{2}}$ and $d_{x^{2}-y^{2}}$, are about 2 eV, which is much larger than those in the pseudocubic and 3\textit{d} layered perovskite oxides. The electronic properties of the Sr$_{2}$\textit{M}O$_{4}$ compounds are discussed in terms of the crystal structure and the extended character of the 4\textit{d} and 5\textit{d} orbitals.